diff --git a/teavm-classlib/pom.xml b/teavm-classlib/pom.xml
index 409012dec..ce5449982 100644
--- a/teavm-classlib/pom.xml
+++ b/teavm-classlib/pom.xml
@@ -82,40 +82,10 @@
             <argument>java.util.logging</argument>
             <argument>java.util.concurrent</argument>
             <argument>-output</argument>
-            <argument>${project.build.directory}/jcl-report/jcl-comparision.json</argument>
+            <argument>${project.build.directory}/jcl-report</argument>
           </arguments>
         </configuration>
       </plugin>
     </plugins>
-    <pluginManagement>
-      <plugins>
-        <!--This plugin's configuration is used to store Eclipse m2e settings only.
-        It has no influence on the Maven build itself.-->
-        <plugin>
-          <groupId>org.eclipse.m2e</groupId>
-          <artifactId>lifecycle-mapping</artifactId>
-          <version>1.0.0</version>
-          <configuration>
-            <lifecycleMappingMetadata>
-              <pluginExecutions>
-                <pluginExecution>
-                  <pluginExecutionFilter>
-                    <groupId>org.teavm</groupId>
-                    <artifactId>teavm-maven-plugin</artifactId>
-                    <versionRange>[0.0.1-SNAPSHOT,)</versionRange>
-                    <goals>
-                      <goal>build-test-javascript</goal>
-                    </goals>
-                  </pluginExecutionFilter>
-                  <action>
-                    <ignore></ignore>
-                  </action>
-                </pluginExecution>
-              </pluginExecutions>
-            </lifecycleMappingMetadata>
-          </configuration>
-        </plugin>
-      </plugins>
-    </pluginManagement>
   </build>
 </project>
\ No newline at end of file
diff --git a/teavm-classlib/src/main/java/org/teavm/classlib/impl/JCLClass.java b/teavm-classlib/src/main/java/org/teavm/classlib/impl/JCLClass.java
new file mode 100644
index 000000000..a77f5d789
--- /dev/null
+++ b/teavm-classlib/src/main/java/org/teavm/classlib/impl/JCLClass.java
@@ -0,0 +1,33 @@
+/*
+ *  Copyright 2014 Alexey Andreev.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package org.teavm.classlib.impl;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ *
+ * @author Alexey Andreev <konsoletyper@gmail.com>
+ */
+class JCLClass {
+    public final String name;
+    public JCLStatus status;
+    public final List<JCLItem> items = new ArrayList<>();
+
+    public JCLClass(String name) {
+        this.name = name;
+    }
+}
diff --git a/teavm-classlib/src/main/java/org/teavm/classlib/impl/JCLComparisonBuilder.java b/teavm-classlib/src/main/java/org/teavm/classlib/impl/JCLComparisonBuilder.java
index a997a64e0..d87005972 100644
--- a/teavm-classlib/src/main/java/org/teavm/classlib/impl/JCLComparisonBuilder.java
+++ b/teavm-classlib/src/main/java/org/teavm/classlib/impl/JCLComparisonBuilder.java
@@ -17,10 +17,10 @@ package org.teavm.classlib.impl;
 
 import java.io.*;
 import java.net.URL;
-import java.util.HashSet;
-import java.util.Set;
+import java.util.*;
 import java.util.jar.JarEntry;
 import java.util.jar.JarInputStream;
+import org.apache.commons.io.IOUtils;
 import org.objectweb.asm.ClassReader;
 import org.teavm.parsing.ClasspathClassHolderSource;
 
@@ -32,10 +32,11 @@ public class JCLComparisonBuilder {
     private static final String JAR_PREFIX = "jar:file:";
     private static final String JAR_SUFFIX = "!/java/lang/Object.class";
     private static final String CLASS_SUFFIX = ".class";
+    private static final String TEMPLATE_PLACEHOLDER = "${CONTENT}";
     private Set<String> packages = new HashSet<>();
     private ClassLoader classLoader = JCLComparisonBuilder.class.getClassLoader();
     private JCLComparisonVisitor visitor;
-    private String outputFile;
+    private String outputDirectory;
 
     public ClassLoader getClassLoader() {
         return classLoader;
@@ -49,24 +50,24 @@ public class JCLComparisonBuilder {
         return packages;
     }
 
-    public String getOutputFile() {
-        return outputFile;
+    public String getOutputDirectory() {
+        return outputDirectory;
     }
 
-    public void setOutputFile(String outputFile) {
-        this.outputFile = outputFile;
+    public void setOutputDirectory(String outputDirectory) {
+        this.outputDirectory = outputDirectory;
     }
 
     public static void main(String[] args) throws IOException {
         if (args.length == 0) {
-            System.err.println("Usage: package.name [package.name2 ...]");
+            System.err.println("Usage: package.name [package.name2 ...] [-output directory]");
             System.exit(1);
         }
         JCLComparisonBuilder builder = new JCLComparisonBuilder();
 
         for (int i = 0; i < args.length; ++i) {
             if (args[i].equals("-output")) {
-                builder.setOutputFile(args[++i]);
+                builder.setOutputDirectory(args[++i]);
             } else {
                 builder.getPackages().add(args[i].replace('.', '/'));
             }
@@ -76,6 +77,24 @@ public class JCLComparisonBuilder {
     }
 
     public void buildComparisonReport() throws IOException {
+        List<JCLPackage> packages = buildModel();
+        processModel(packages);
+        new File(outputDirectory).mkdirs();
+        copyResource("html/class_obj.png");
+        copyResource("html/field_protected_obj.png");
+        copyResource("html/field_public_obj.png");
+        copyResource("html/jcl.css");
+        copyResource("html/methpro_obj.png");
+        copyResource("html/methpub_obj.png");
+        copyResource("html/package_obj.png");
+        try (Writer out = new OutputStreamWriter(new FileOutputStream(new File(
+                outputDirectory, "jcl.html")), "UTF-8")) {
+            generateHtml(out, packages);
+        }
+    }
+
+    private List<JCLPackage> buildModel() throws IOException {
+        Map<String, JCLPackage> packageMap = new HashMap<>();
         URL url = classLoader.getResource("java/lang/Object" + CLASS_SUFFIX);
         String path = url.toString();
         if (!path.startsWith(JAR_PREFIX) || !path.endsWith(JAR_SUFFIX)) {
@@ -83,14 +102,12 @@ public class JCLComparisonBuilder {
         }
         ClasspathClassHolderSource classSource = new ClasspathClassHolderSource(classLoader);
         path = path.substring(JAR_PREFIX.length(), path.length() - JAR_SUFFIX.length());
-        File outDir = new File(outputFile).getParentFile();
+        File outDir = new File(outputDirectory).getParentFile();
         if (!outDir.exists()) {
             outDir.mkdirs();
         }
-        try (JarInputStream jar = new JarInputStream(new FileInputStream(path));
-             PrintStream out = new PrintStream(new FileOutputStream(outputFile))) {
-            out.println("{");
-            visitor = new JCLComparisonVisitor(classSource, out);
+        try (JarInputStream jar = new JarInputStream(new FileInputStream(path))) {
+            visitor = new JCLComparisonVisitor(classSource, packageMap);
             while (true) {
                 JarEntry entry = jar.getNextJarEntry();
                 if (entry == null) {
@@ -101,8 +118,22 @@ public class JCLComparisonBuilder {
                 }
                 jar.closeEntry();
             }
-            out.println();
-            out.println("}");
+        }
+        return new ArrayList<>(packageMap.values());
+    }
+
+    private void processModel(List<JCLPackage> packages) {
+        Collections.sort(packages, new Comparator<JCLPackage>() {
+            @Override public int compare(JCLPackage o1, JCLPackage o2) {
+                return o1.name.compareTo(o2.name);
+            }
+        });
+        for (JCLPackage pkg : packages) {
+            Collections.sort(pkg.classes, new Comparator<JCLClass>() {
+                @Override public int compare(JCLClass o1, JCLClass o2) {
+                    return o1.name.compareTo(o2.name);
+                }
+            });
         }
     }
 
@@ -115,7 +146,121 @@ public class JCLComparisonBuilder {
     }
 
     private void compareClass(InputStream input) throws IOException {
-        ClassReader reader = new ClassReader(input);
+        byte[] buffer = IOUtils.toByteArray(input);
+        ClassReader reader = new ClassReader(buffer);
         reader.accept(visitor, 0);
     }
+
+    private void copyResource(String name) throws IOException {
+        String simpleName = name.substring(name.lastIndexOf('/') + 1);
+        try (InputStream input = classLoader.getResourceAsStream(name);
+                OutputStream output = new FileOutputStream(new File(outputDirectory, simpleName))) {
+            IOUtils.copy(input, output);
+        }
+    }
+
+    private void generateHtml(Writer out, List<JCLPackage> packages) throws IOException {
+        String template;
+        try (Reader reader = new InputStreamReader(classLoader.getResourceAsStream("html/jcl.html"), "UTF-8")) {
+            template = IOUtils.toString(reader);
+        }
+        int placeholderIndex = template.indexOf(TEMPLATE_PLACEHOLDER);
+        String header = template.substring(0, placeholderIndex);
+        String footer = template.substring(placeholderIndex + TEMPLATE_PLACEHOLDER.length());
+        out.write(header);
+        for (JCLPackage pkg : packages) {
+            int totalClasses = pkg.classes.size();
+            int fullClasses = 0;
+            int partialClasses = 0;
+            for (JCLClass cls : pkg.classes) {
+                switch (cls.status) {
+                    case FOUND:
+                        fullClasses++;
+                        partialClasses++;
+                        break;
+                    case PARTIAL:
+                        partialClasses++;
+                        break;
+                    default:
+                        break;
+                }
+            }
+            writeRow(out, "package", pkg.status, pkg.name,
+                    totalClasses > 0 ? fullClasses * 100 / totalClasses : null,
+                    totalClasses > 0 ? partialClasses * 100 / totalClasses : null);
+            for (JCLClass cls : pkg.classes) {
+                int implemented = 0;
+                for (JCLItem item : cls.items) {
+                    if (item.status != JCLStatus.MISSING) {
+                        ++implemented;
+                    }
+                }
+                writeRow(out, "class", cls.status, cls.name,
+                        !cls.items.isEmpty() ? implemented * 100 / cls.items.size() : null, null);
+                for (JCLItem item : cls.items) {
+                    String type;
+                    switch (item.type) {
+                        case FIELD:
+                            type = "field";
+                            break;
+                        case METHOD:
+                            type = "method";
+                            break;
+                        default:
+                            type = "";
+                            break;
+                    }
+                    writeRow(out, type, item.status, item.name, null, null);
+                }
+            }
+        }
+        out.write(footer);
+    }
+
+    private void writeRow(Writer out, String type, JCLStatus status, String name, Integer percent,
+            Integer partialPercent) throws IOException {
+        out.write("<tr class=\"");
+        switch (status) {
+            case FOUND:
+                out.write("full");
+                break;
+            case MISSING:
+                out.write("missing");
+                break;
+            case PARTIAL:
+                out.write("partial");
+                break;
+        }
+        out.write("\">\n");
+        out.write("<td><div class=\"");
+        out.write(type);
+        out.write("\">");
+        out.write(escape(name));
+        out.write("</div></td>\n");
+        out.write("<td class=\"percent\">" + (partialPercent != null ? partialPercent.toString() : "") + "</td>");
+        out.write("<td class=\"percent\">" + (percent != null ? percent.toString() : "") + "</td>");
+        out.write("</tr>\n");
+    }
+
+    private String escape(String string) {
+        StringBuilder sb = new StringBuilder();
+        for (int i = 0; i < string.length(); ++i) {
+            char ch = string.charAt(i);
+            switch (ch) {
+                case '<':
+                    sb.append("&lt;");
+                    break;
+                case '>':
+                    sb.append("&gt;");
+                    break;
+                case '"':
+                    sb.append("&quot;");
+                    break;
+                default:
+                    sb.append(ch);
+                    break;
+            }
+        }
+        return sb.toString();
+    }
 }
diff --git a/teavm-classlib/src/main/java/org/teavm/classlib/impl/JCLComparisonVisitor.java b/teavm-classlib/src/main/java/org/teavm/classlib/impl/JCLComparisonVisitor.java
index ea412d88a..09b218461 100644
--- a/teavm-classlib/src/main/java/org/teavm/classlib/impl/JCLComparisonVisitor.java
+++ b/teavm-classlib/src/main/java/org/teavm/classlib/impl/JCLComparisonVisitor.java
@@ -15,7 +15,7 @@
  */
 package org.teavm.classlib.impl;
 
-import java.io.PrintStream;
+import java.util.Map;
 import org.objectweb.asm.*;
 import org.teavm.model.*;
 import org.teavm.model.ClassReader;
@@ -25,84 +25,103 @@ import org.teavm.model.ClassReader;
  * @author Alexey Andreev
  */
 class JCLComparisonVisitor implements ClassVisitor {
-    private PrintStream out;
+    private Map<String, JCLPackage> packageMap;
     private ClassReaderSource classSource;
-    private boolean first = true;
-    private boolean firstItem;
-    private boolean pass;
-    private boolean ended;
     private ClassReader classReader;
+    private JCLPackage jclPackage;
+    private JCLClass jclClass;
 
-    public JCLComparisonVisitor(ClassReaderSource classSource, PrintStream out) {
+    public JCLComparisonVisitor(ClassReaderSource classSource, Map<String, JCLPackage> packageMap) {
         this.classSource = classSource;
-        this.out = out;
+        this.packageMap = packageMap;
     }
 
     @Override
     public void visit(int version, int access, String name, String signature, String superName, String[] interfaces) {
-        if ((access & Opcodes.ACC_PUBLIC) == 0) {
+        if ((access & (Opcodes.ACC_PUBLIC | Opcodes.ACC_PROTECTED)) == 0) {
+            jclClass = null;
+            classReader = null;
             return;
         }
         String javaName = name.replace('/', '.');
-        if (!first) {
-            out.println(",");
+        int dotIndex = javaName.lastIndexOf('.');
+        String packageName = javaName.substring(0, dotIndex);
+        String simpleName = javaName.substring(dotIndex + 1);
+        jclPackage = packageMap.get(packageName);
+        if (jclPackage == null) {
+            jclPackage = new JCLPackage(packageName);
+            jclPackage.status = JCLStatus.FOUND;
+            packageMap.put(packageName, jclPackage);
         }
-        first = false;
-        out.println("    \"" + javaName + "\" : {");
         classReader = classSource.get(javaName);
-        if (classReader == null) {
-            out.println("        \"implemented\" : false");
-            pass = true;
-        } else {
-            out.println("        \"implemented\" : true,");
-            out.println("        \"items\" : [");
-            pass = false;
-        }
-        ended = false;
-        firstItem = true;
+        jclClass = new JCLClass(simpleName);
+        jclClass.status = classReader != null ? JCLStatus.FOUND : JCLStatus.MISSING;
+        jclPackage.classes.add(jclClass);
     }
 
     @Override
     public FieldVisitor visitField(int access, String name, String desc, String signature, Object value) {
-        if (pass) {
+        if (classReader == null || (access & (Opcodes.ACC_PUBLIC | Opcodes.ACC_PROTECTED)) == 0) {
             return null;
         }
-        if ((access & (Opcodes.ACC_PUBLIC | Opcodes.ACC_PROTECTED)) == 0) {
-            return null;
-        }
-        if (!firstItem) {
-            out.println(",");
-        }
-        firstItem = false;
-        out.println("            {");
-        out.println("                 \"type\" : \"field\",");
-        out.println("                 \"name\" : \"" + name + "\",");
-        out.println("                 \"descriptor\" : \"" + desc + "\",");
+        JCLItem item = new JCLItem(JCLItemType.FIELD, name + " : " + desc);
         FieldReader field = classReader.getField(name);
-        out.println("                 \"implemented\" : \"" + (field != null ? "true" : "false") + "\",");
-        out.print("            }");
+        item.status = field != null ? JCLStatus.FOUND : JCLStatus.MISSING;
+        jclClass.items.add(item);
+        if (item.status == JCLStatus.MISSING) {
+            jclClass.status = JCLStatus.PARTIAL;
+        }
         return null;
     }
 
     @Override
     public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
-        if (pass) {
+        if (classReader == null || (access & (Opcodes.ACC_PUBLIC | Opcodes.ACC_PROTECTED)) == 0) {
             return null;
         }
-        if ((access & (Opcodes.ACC_PUBLIC | Opcodes.ACC_PROTECTED)) == 0) {
-            return null;
+
+        JCLItem item = new JCLItem(JCLItemType.METHOD, name + desc);
+        MethodReader method = findMethod(classReader, MethodDescriptor.parse(name + desc));
+        if (method == null) {
+            item.status = JCLStatus.MISSING;
+        } else {
+            if ((access & Opcodes.ACC_ABSTRACT) == 0 && method.hasModifier(ElementModifier.ABSTRACT)) {
+                item.status = JCLStatus.MISSING;
+            } else {
+                item.status = method.getOwnerName().equals(classReader.getName()) ?
+                        JCLStatus.FOUND : JCLStatus.PARTIAL;
+            }
         }
-        if (!firstItem) {
-            out.println(",");
+        jclClass.items.add(item);
+        if (item.status == JCLStatus.MISSING) {
+            jclClass.status = JCLStatus.PARTIAL;
+        }
+        return null;
+    }
+
+    private MethodReader findMethod(ClassReader cls, MethodDescriptor desc) {
+        MethodReader method = cls.getMethod(desc);
+        if (method != null) {
+            return method;
+        }
+        if (cls.getParent() != null) {
+            ClassReader parent = classSource.get(cls.getParent());
+            if (parent != null) {
+                method = findMethod(parent, desc);
+                if (method != null) {
+                    return method;
+                }
+            }
+        }
+        for (String ifaceName : cls.getInterfaces()) {
+            ClassReader iface = classSource.get(ifaceName);
+            if (iface != null) {
+                method = findMethod(iface, desc);
+                if (method != null) {
+                    return method;
+                }
+            }
         }
-        firstItem = false;
-        out.println("            {");
-        out.println("                 \"type\" : \"method\",");
-        out.println("                 \"name\" : \"" + name + "\",");
-        out.println("                 \"descriptor\" : \"" + desc + "\",");
-        MethodReader method = classReader.getMethod(MethodDescriptor.parse(name + desc));
-        out.println("                 \"implemented\" : \"" + (method != null ? "true" : "false") + "\",");
-        out.print("            }");
         return null;
     }
 
@@ -129,15 +148,8 @@ class JCLComparisonVisitor implements ClassVisitor {
 
     @Override
     public void visitEnd() {
-        if (!ended) {
-            if (!pass) {
-                if (!firstItem) {
-                    out.println();
-                }
-                out.println("        ]");
-            }
-            out.print("    }");
-            ended = true;
+        if (jclClass == null || jclClass.status != JCLStatus.FOUND) {
+            jclPackage.status = JCLStatus.PARTIAL;
         }
     }
 }
diff --git a/teavm-classlib/src/main/java/org/teavm/classlib/impl/JCLItem.java b/teavm-classlib/src/main/java/org/teavm/classlib/impl/JCLItem.java
new file mode 100644
index 000000000..8fa689343
--- /dev/null
+++ b/teavm-classlib/src/main/java/org/teavm/classlib/impl/JCLItem.java
@@ -0,0 +1,31 @@
+/*
+ *  Copyright 2014 Alexey Andreev.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package org.teavm.classlib.impl;
+
+/**
+ *
+ * @author Alexey Andreev <konsoletyper@gmail.com>
+ */
+class JCLItem {
+    public final JCLItemType type;
+    public final String name;
+    public JCLStatus status;
+
+    public JCLItem(JCLItemType type, String name) {
+        this.type = type;
+        this.name = name;
+    }
+}
diff --git a/teavm-classlib/src/main/java/org/teavm/classlib/impl/JCLItemType.java b/teavm-classlib/src/main/java/org/teavm/classlib/impl/JCLItemType.java
new file mode 100644
index 000000000..5bd66c172
--- /dev/null
+++ b/teavm-classlib/src/main/java/org/teavm/classlib/impl/JCLItemType.java
@@ -0,0 +1,25 @@
+/*
+ *  Copyright 2014 Alexey Andreev.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package org.teavm.classlib.impl;
+
+/**
+ *
+ * @author Alexey Andreev <konsoletyper@gmail.com>
+ */
+enum JCLItemType {
+    FIELD,
+    METHOD
+}
diff --git a/teavm-classlib/src/main/java/org/teavm/classlib/impl/JCLPackage.java b/teavm-classlib/src/main/java/org/teavm/classlib/impl/JCLPackage.java
new file mode 100644
index 000000000..e527931fd
--- /dev/null
+++ b/teavm-classlib/src/main/java/org/teavm/classlib/impl/JCLPackage.java
@@ -0,0 +1,33 @@
+/*
+ *  Copyright 2014 Alexey Andreev.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package org.teavm.classlib.impl;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ *
+ * @author Alexey Andreev <konsoletyper@gmail.com>
+ */
+class JCLPackage {
+    public final String name;
+    public JCLStatus status;
+    public final List<JCLClass> classes = new ArrayList<>();
+
+    public JCLPackage(String name) {
+        this.name = name;
+    }
+}
diff --git a/teavm-classlib/src/main/java/org/teavm/classlib/impl/JCLStatus.java b/teavm-classlib/src/main/java/org/teavm/classlib/impl/JCLStatus.java
new file mode 100644
index 000000000..c951f4b38
--- /dev/null
+++ b/teavm-classlib/src/main/java/org/teavm/classlib/impl/JCLStatus.java
@@ -0,0 +1,26 @@
+/*
+ *  Copyright 2014 Alexey Andreev.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package org.teavm.classlib.impl;
+
+/**
+ *
+ * @author Alexey Andreev <konsoletyper@gmail.com>
+ */
+enum JCLStatus {
+    FOUND,
+    MISSING,
+    PARTIAL
+}
diff --git a/teavm-classlib/src/main/resources/html/class_obj.png b/teavm-classlib/src/main/resources/html/class_obj.png
new file mode 100644
index 000000000..c57c2d00f
Binary files /dev/null and b/teavm-classlib/src/main/resources/html/class_obj.png differ
diff --git a/teavm-classlib/src/main/resources/html/field_protected_obj.png b/teavm-classlib/src/main/resources/html/field_protected_obj.png
new file mode 100644
index 000000000..dc80489bc
Binary files /dev/null and b/teavm-classlib/src/main/resources/html/field_protected_obj.png differ
diff --git a/teavm-classlib/src/main/resources/html/field_public_obj.png b/teavm-classlib/src/main/resources/html/field_public_obj.png
new file mode 100644
index 000000000..40a5ef1c8
Binary files /dev/null and b/teavm-classlib/src/main/resources/html/field_public_obj.png differ
diff --git a/teavm-classlib/src/main/resources/html/jcl-test.html b/teavm-classlib/src/main/resources/html/jcl-test.html
new file mode 100644
index 000000000..715af11f5
--- /dev/null
+++ b/teavm-classlib/src/main/resources/html/jcl-test.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>JCL emulation information</title>
+    <meta http-equiv="Content-Type" content="text/html;charset=UTF-8"/>
+    <link rel="stylesheet" href="jcl.css" type="text/css"/>
+  </head>
+  <body>
+    <table>
+      <thead>
+        <tr>
+          <th>Item</th>
+          <th>% of partially implemented</th>
+          <th>% of fully implemented</th>
+        </tr>
+      </thead>
+      <tbody>
+        <tr class="full">
+          <td><div class="package">java.lang</div></td>
+          <td class="percent">100%</td>
+          <td class="percent">0%</td>
+        </tr>
+        <tr class="partial">
+          <td><div class="class">Object</div></td>
+          <td class="percent"></td>
+          <td class="percent">50%</td>
+        </tr>
+        <tr class="full">
+          <td><div class="field">$id</div></td>
+          <td class="percent"></td>
+          <td class="percent"></td>
+        </tr>
+        <tr class="full">
+          <td><div class="method">clone()</div></td>
+          <td></td>
+          <td></td>
+        </tr>
+        <tr class="missing">
+          <td><div class="method">getClass()</div></td>
+          <td></td>
+          <td></td>
+        </tr>
+      </tbody>
+    </table>
+  </body>
+</html>
\ No newline at end of file
diff --git a/teavm-classlib/src/main/resources/html/jcl.css b/teavm-classlib/src/main/resources/html/jcl.css
new file mode 100644
index 000000000..3106bc5a0
--- /dev/null
+++ b/teavm-classlib/src/main/resources/html/jcl.css
@@ -0,0 +1,74 @@
+* {
+    font-family: sans-serif;
+    font-size: 14pt;
+    line-height: 125%;
+}
+
+table {
+    border-collapse: collapse;
+    margin: 1em;
+    border-color: rgb(160,160,160);
+    border-style: solid;
+    border-width: 1px;
+}
+th {
+    padding-left: 1em;
+    padding-right: 1em;
+    padding-top: 0.25em;
+    padding-bottom: 0.25em;
+    border-width: 1px;
+    border-color: rgb(160,160,160);
+    border-top-style: solid;
+    border-bottom-style: solid;
+    background-color: rgb(220,220,220);
+}
+
+.full {
+    background-color: rgb(200,255,200);
+}
+.missing {
+    background-color: rgb(255,200,200);
+}
+.partial {
+    background-color: rgb(255,255,200);
+}
+.percent {
+    text-align: right;
+}
+
+.package, .class, .protected-class, .field, .protected-field, .method, .protected-method {
+    background-repeat: no-repeat;
+    padding-right: 6px;
+}
+
+.package {
+    padding-left: 35px;
+    background-position: 16px 50%;
+}
+.class {
+    padding-left: 51px;
+    background-position: 32px 50%;
+}
+.field, .protected-field, .method, .protected-method {
+    padding-left: 67px;
+    background-position: 48px 50%;
+}
+
+.package {
+    background-image: url(package_obj.png);
+}
+.class {
+    background-image: url(class_obj.png);
+}
+.field {
+    background-image: url(field_public_obj.png);
+}
+.protected-field {
+    background-image: url(field_protected_obj.png);
+}
+.method {
+    background-image: url(methpub_obj.png);
+}
+.protected-method {
+    background-image: url(methpro_obj.png);
+}
\ No newline at end of file
diff --git a/teavm-classlib/src/main/resources/html/jcl.html b/teavm-classlib/src/main/resources/html/jcl.html
new file mode 100644
index 000000000..a8add2679
--- /dev/null
+++ b/teavm-classlib/src/main/resources/html/jcl.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>JCL emulation information</title>
+    <meta http-equiv="Content-Type" content="text/html;charset=UTF-8"/>
+    <link rel="stylesheet" href="jcl.css" type="text/css"/>
+  </head>
+  <body>
+    <table>
+      <thead>
+        <tr>
+          <th>Item</th>
+          <th>% of partially implemented</th>
+          <th>% of fully implemented</th>
+        </tr>
+      </thead>
+      <tbody>
+        ${CONTENT}
+      </tbody>
+    </table>
+  </body>
+</html>
\ No newline at end of file
diff --git a/teavm-classlib/src/main/resources/html/methpro_obj.png b/teavm-classlib/src/main/resources/html/methpro_obj.png
new file mode 100644
index 000000000..3e4c0d785
Binary files /dev/null and b/teavm-classlib/src/main/resources/html/methpro_obj.png differ
diff --git a/teavm-classlib/src/main/resources/html/methpub_obj.png b/teavm-classlib/src/main/resources/html/methpub_obj.png
new file mode 100644
index 000000000..300419528
Binary files /dev/null and b/teavm-classlib/src/main/resources/html/methpub_obj.png differ
diff --git a/teavm-classlib/src/main/resources/html/package_obj.png b/teavm-classlib/src/main/resources/html/package_obj.png
new file mode 100644
index 000000000..0afea5b86
Binary files /dev/null and b/teavm-classlib/src/main/resources/html/package_obj.png differ
diff --git a/teavm-core/src/main/java/org/teavm/parsing/ClassRefsRenamer.java b/teavm-core/src/main/java/org/teavm/parsing/ClassRefsRenamer.java
index 8ba12f15a..872d4584d 100644
--- a/teavm-core/src/main/java/org/teavm/parsing/ClassRefsRenamer.java
+++ b/teavm-core/src/main/java/org/teavm/parsing/ClassRefsRenamer.java
@@ -62,7 +62,10 @@ class ClassRefsRenamer implements InstructionVisitor {
         }
         rename(cls.getAnnotations(), renamedCls.getAnnotations());
         for (String iface : cls.getInterfaces()) {
-            renamedCls.getInterfaces().add(classNameMapper.map(iface));
+            String mappedIfaceName = classNameMapper.map(iface);
+            if (!mappedIfaceName.equals(renamedCls.getName())) {
+                renamedCls.getInterfaces().add(mappedIfaceName);
+            }
         }
         return renamedCls;
     }
diff --git a/teavm-html4j/pom.xml b/teavm-html4j/pom.xml
index fa69043b5..7032dad72 100644
--- a/teavm-html4j/pom.xml
+++ b/teavm-html4j/pom.xml
@@ -114,31 +114,6 @@
             <skip>true</skip>
           </configuration>
         </plugin>
-        <!--This plugin's configuration is used to store Eclipse m2e settings only. It has no influence on the Maven build itself.-->
-        <plugin>
-          <groupId>org.eclipse.m2e</groupId>
-          <artifactId>lifecycle-mapping</artifactId>
-          <version>1.0.0</version>
-          <configuration>
-            <lifecycleMappingMetadata>
-              <pluginExecutions>
-                <pluginExecution>
-                  <pluginExecutionFilter>
-                    <groupId>org.teavm</groupId>
-                    <artifactId>teavm-maven-plugin</artifactId>
-                    <versionRange>[0.0.1-SNAPSHOT,)</versionRange>
-                    <goals>
-                      <goal>build-test-javascript</goal>
-                    </goals>
-                  </pluginExecutionFilter>
-                  <action>
-                    <ignore></ignore>
-                  </action>
-                </pluginExecution>
-              </pluginExecutions>
-            </lifecycleMappingMetadata>
-          </configuration>
-        </plugin>
       </plugins>
     </pluginManagement>
   </build>