diff --git a/teavm-classlib/src/main/java/org/teavm/classlib/java/util/TCollections.java b/teavm-classlib/src/main/java/org/teavm/classlib/java/util/TCollections.java
index 308115072..21028d7bb 100644
--- a/teavm-classlib/src/main/java/org/teavm/classlib/java/util/TCollections.java
+++ b/teavm-classlib/src/main/java/org/teavm/classlib/java/util/TCollections.java
@@ -172,4 +172,15 @@ public class TCollections extends TObject {
             }
         });
     }
+
+    public static void reverse(TList<?> list) {
+        @SuppressWarnings("unchecked")
+        TList<Object> safeList = (TList<Object>)list;
+        int half = safeList.size() / 2;
+        for (int i = 0; i < half; ++i) {
+            Object tmp = safeList.get(i);
+            safeList.set(i, safeList.get(safeList.size() - i - 1));
+            safeList.set(safeList.size() - i - 1, tmp);
+        }
+    }
 }
diff --git a/teavm-classlib/src/main/java/org/teavm/classlib/java/util/TTimer.java b/teavm-classlib/src/main/java/org/teavm/classlib/java/util/TTimer.java
new file mode 100644
index 000000000..4585cec6a
--- /dev/null
+++ b/teavm-classlib/src/main/java/org/teavm/classlib/java/util/TTimer.java
@@ -0,0 +1,59 @@
+/*
+ *  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.java.util;
+
+import org.teavm.classlib.java.lang.TIllegalStateException;
+import org.teavm.classlib.java.lang.TObject;
+import org.teavm.classlib.java.lang.TString;
+import org.teavm.dependency.PluggableDependency;
+import org.teavm.javascript.ni.GeneratedBy;
+
+/**
+ *
+ * @author Alexey Andreev
+ */
+public class TTimer extends TObject {
+    TSet<TTimerTask> tasks = new THashSet<>();
+    private boolean cancelled;
+
+    public TTimer() {
+    }
+
+    public TTimer(@SuppressWarnings("unused") TString name) {
+    }
+
+    public void cancel() {
+        if (cancelled) {
+            return;
+        }
+        cancelled = true;
+        for (TTimerTask task : tasks.toArray(new TTimerTask[0])) {
+            task.cancel();
+        }
+    }
+
+    public void schedule(TTimerTask task, long delay) {
+        if (cancelled || task.timer != null || task.nativeTimerId >= 0) {
+            throw new TIllegalStateException();
+        }
+        task.timer = this;
+        task.nativeTimerId = scheduleOnce(task, (int)delay);
+    }
+
+    @GeneratedBy(TimerNativeGenerator.class)
+    @PluggableDependency(TimerNativeGenerator.class)
+    private static native int scheduleOnce(TTimerTask task, int delay);
+}
diff --git a/teavm-classlib/src/main/java/org/teavm/classlib/java/util/TTimerTask.java b/teavm-classlib/src/main/java/org/teavm/classlib/java/util/TTimerTask.java
new file mode 100644
index 000000000..1271e3e20
--- /dev/null
+++ b/teavm-classlib/src/main/java/org/teavm/classlib/java/util/TTimerTask.java
@@ -0,0 +1,44 @@
+/*
+ *  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.java.util;
+
+import org.teavm.classlib.java.lang.TObject;
+import org.teavm.classlib.java.lang.TRunnable;
+
+/**
+ *
+ * @author Alexey Andreev
+ */
+public abstract class TTimerTask extends TObject implements TRunnable {
+    TTimer timer;
+    int nativeTimerId = -1;
+
+    public boolean cancel() {
+        if (timer == null) {
+            return false;
+        }
+        timer = null;
+        return true;
+    }
+
+    void performOnce() {
+        if (timer != null) {
+            run();
+            timer.tasks.remove(this);
+            timer = null;
+        }
+    }
+}
diff --git a/teavm-classlib/src/main/java/org/teavm/classlib/java/util/TimerNativeGenerator.java b/teavm-classlib/src/main/java/org/teavm/classlib/java/util/TimerNativeGenerator.java
new file mode 100644
index 000000000..387f44216
--- /dev/null
+++ b/teavm-classlib/src/main/java/org/teavm/classlib/java/util/TimerNativeGenerator.java
@@ -0,0 +1,62 @@
+/*
+ *  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.java.util;
+
+import java.io.IOException;
+import org.teavm.codegen.SourceWriter;
+import org.teavm.dependency.DependencyChecker;
+import org.teavm.dependency.DependencyPlugin;
+import org.teavm.dependency.MethodDependency;
+import org.teavm.javascript.ni.Generator;
+import org.teavm.javascript.ni.GeneratorContext;
+import org.teavm.model.MethodReference;
+import org.teavm.model.ValueType;
+
+/**
+ *
+ * @author Alexey Andreev
+ */
+public class TimerNativeGenerator implements Generator, DependencyPlugin {
+    private static final MethodReference performOnceRef = new MethodReference("java.util.TimerTask",
+            "performOnce", ValueType.VOID);
+
+    @Override
+    public void methodAchieved(DependencyChecker checker, MethodDependency method) {
+        switch (method.getReference().getName()) {
+            case "scheduleOnce": {
+                MethodDependency performMethod = checker.linkMethod(performOnceRef, method.getStack());
+                method.getVariable(1).connect(performMethod.getVariable(1));
+                break;
+            }
+        }
+    }
+
+    @Override
+    public void generate(GeneratorContext context, SourceWriter writer, MethodReference methodRef) throws IOException {
+        switch (methodRef.getName()) {
+            case "scheduleOnce":
+                generateScheduleNative(context, writer);
+                break;
+        }
+    }
+
+    private void generateScheduleNative(GeneratorContext context, SourceWriter writer) throws IOException {
+        writer.append("return setTimeout(function() {").indent().softNewLine();
+        writer.append(context.getParameterName(1)).append(".").appendMethod(performOnceRef)
+                .append("();").softNewLine();
+        writer.outdent().append("},").ws().append(context.getParameterName(2)).append(");").softNewLine();
+    }
+}
diff --git a/teavm-core/src/main/java/org/teavm/model/util/InstructionVariableMapper.java b/teavm-core/src/main/java/org/teavm/model/util/InstructionVariableMapper.java
index 2e6ad423d..fc9af0584 100644
--- a/teavm-core/src/main/java/org/teavm/model/util/InstructionVariableMapper.java
+++ b/teavm-core/src/main/java/org/teavm/model/util/InstructionVariableMapper.java
@@ -118,7 +118,7 @@ public abstract class InstructionVariableMapper implements InstructionVisitor {
 
     @Override
     public void visit(SwitchInstruction insn) {
-        insn.setCondition(insn.getCondition());
+        insn.setCondition(map(insn.getCondition()));
     }
 
     @Override
diff --git a/teavm-core/src/main/java/org/teavm/parsing/ProgramParser.java b/teavm-core/src/main/java/org/teavm/parsing/ProgramParser.java
index ac8cb63ba..8c3db9edc 100644
--- a/teavm-core/src/main/java/org/teavm/parsing/ProgramParser.java
+++ b/teavm-core/src/main/java/org/teavm/parsing/ProgramParser.java
@@ -98,9 +98,21 @@ public class ProgramParser {
                 }
             }
         }
+        int signatureVars = countSignatureVariables(method.desc);
+        while (program.variableCount() <= signatureVars) {
+            program.createVariable();
+        }
         return program;
     }
 
+    private int countSignatureVariables(String desc) {
+        int count = 1;
+        for (Type paramType : Type.getArgumentTypes(desc)) {
+            count += paramType.getSize();
+        }
+        return count;
+    }
+
     private int pushSingle() {
         stack = new StackFrame(stack, SINGLE);
         return stack.depth;