diff --git a/teavm-classlib/src/main/java/org/teavm/classlib/impl/charset/CharBuffer.java b/teavm-classlib/src/main/java/org/teavm/classlib/impl/charset/CharBuffer.java
index b2332d2ef..52c700ac4 100644
--- a/teavm-classlib/src/main/java/org/teavm/classlib/impl/charset/CharBuffer.java
+++ b/teavm-classlib/src/main/java/org/teavm/classlib/impl/charset/CharBuffer.java
@@ -62,6 +62,10 @@ public class CharBuffer {
         return pos;
     }
 
+    public void skip(int count) {
+        pos += count;
+    }
+
     public void put(CharBuffer buffer) {
         while (buffer.pos < buffer.end) {
             data[pos++] = buffer.data[buffer.pos++];
diff --git a/teavm-classlib/src/main/java/org/teavm/classlib/java/io/TByteArrayInputStream.java b/teavm-classlib/src/main/java/org/teavm/classlib/java/io/TByteArrayInputStream.java
new file mode 100644
index 000000000..b6963a49e
--- /dev/null
+++ b/teavm-classlib/src/main/java/org/teavm/classlib/java/io/TByteArrayInputStream.java
@@ -0,0 +1,85 @@
+/*
+ *  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.io;
+
+import org.teavm.classlib.java.lang.TMath;
+
+/**
+ *
+ * @author Alexey Andreev
+ */
+public class TByteArrayInputStream extends TInputStream {
+    protected byte[] buf;
+    protected int pos;
+    protected int mark;
+    protected int count;
+
+    public TByteArrayInputStream(byte[] buf, int offset, int length) {
+        this.buf = buf;
+        pos = offset;
+        mark = offset;
+        count = offset + length;
+    }
+
+    public TByteArrayInputStream(byte[] buf) {
+        this(buf, 0, buf.length);
+    }
+
+    @Override
+    public int read() {
+        return pos < count ? buf[pos++] : -1;
+    }
+
+    @Override
+    public int read(byte[] b, int off, int len) {
+        int bytesToRead = TMath.min(len, count - pos);
+        for (int i = 0; i < bytesToRead; ++i) {
+            b[off++] = buf[pos++];
+        }
+        return bytesToRead > 0 ? bytesToRead : -1;
+    }
+
+    @Override
+    public long skip(long n) {
+        int bytesSkipped = (int)TMath.min(n, count - pos);
+        pos += bytesSkipped;
+        return bytesSkipped;
+    }
+
+    @Override
+    public int available() {
+        return count - pos;
+    }
+
+    @Override
+    public boolean markSupported() {
+        return true;
+    }
+
+    @Override
+    public void mark(int readAheadLimit) {
+        mark = pos;
+    }
+
+    @Override
+    public void reset() {
+        pos = mark;
+    }
+
+    @Override
+    public void close() {
+    }
+}
diff --git a/teavm-classlib/src/main/java/org/teavm/classlib/java/io/TInputStream.java b/teavm-classlib/src/main/java/org/teavm/classlib/java/io/TInputStream.java
new file mode 100644
index 000000000..8e0255e65
--- /dev/null
+++ b/teavm-classlib/src/main/java/org/teavm/classlib/java/io/TInputStream.java
@@ -0,0 +1,86 @@
+/*
+ *  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.io;
+
+import org.teavm.classlib.java.lang.TInteger;
+import org.teavm.classlib.java.lang.TObject;
+
+/**
+ *
+ * @author Alexey Andreev
+ */
+public abstract class TInputStream extends TObject implements TCloseable {
+    public TInputStream() {
+    }
+
+    public abstract int read() throws TIOException;
+
+    public int read(byte[] b) throws TIOException {
+        return read(b, 0, b.length);
+    }
+
+    public int read(byte[] b, int off, int len) throws TIOException {
+        for (int i = 0; i < len; ++i) {
+            int bt = read();
+            if (bt < 0) {
+                return i;
+            }
+            b[off++] = (byte)bt;
+        }
+        return len > 0 ? len : -1;
+    }
+
+    public long skip(long n) throws TIOException {
+        if (n < TInteger.MAX_VALUE) {
+            return skip((int)n);
+        } else {
+            for (long i = 0; i < n; ++i) {
+                if (read() < 0) {
+                    return i;
+                }
+            }
+            return n;
+        }
+    }
+
+    private int skip(int n) throws TIOException {
+        for (int i = 0; i < n; ++i) {
+            if (read() < 0) {
+                return i;
+            }
+        }
+        return n;
+    }
+
+    public int available() throws TIOException {
+        return 0;
+    }
+
+    @Override
+    public void close() throws TIOException {
+    }
+
+    public void mark(@SuppressWarnings("unused") int readlimit) {
+    }
+
+    public void reset() throws TIOException {
+        throw new TIOException();
+    }
+
+    public boolean markSupported() {
+        return false;
+    }
+}
diff --git a/teavm-classlib/src/main/java/org/teavm/classlib/java/io/TInputStreamReader.java b/teavm-classlib/src/main/java/org/teavm/classlib/java/io/TInputStreamReader.java
new file mode 100644
index 000000000..2a39581aa
--- /dev/null
+++ b/teavm-classlib/src/main/java/org/teavm/classlib/java/io/TInputStreamReader.java
@@ -0,0 +1,133 @@
+/*
+ *  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.io;
+
+import org.teavm.classlib.impl.charset.ByteBuffer;
+import org.teavm.classlib.impl.charset.CharBuffer;
+import org.teavm.classlib.impl.charset.Charset;
+import org.teavm.classlib.impl.charset.UTF8Charset;
+import org.teavm.classlib.java.lang.TString;
+
+/**
+ *
+ * @author Alexey Andreev
+ */
+public class TInputStreamReader extends TReader {
+    private TInputStream stream;
+    private Charset charset;
+    private TString charsetName;
+    private byte[] inData = new byte[8192];
+    private ByteBuffer inBuffer = new ByteBuffer(inData);
+    private char[] outData = new char[1024];
+    private CharBuffer outBuffer = new CharBuffer(outData);
+    private boolean streamEof;
+    private boolean eof;
+
+    public TInputStreamReader(TInputStream in, TString charsetName) {
+        this(in, Charset.get(charsetName.toString()));
+        this.charsetName = charsetName;
+    }
+
+    public TInputStreamReader(TInputStream in) {
+        this(in, new UTF8Charset());
+        charsetName = TString.wrap("UTF-8");
+    }
+
+    private TInputStreamReader(TInputStream in, Charset charset) {
+        this.stream = in;
+        this.charset = charset;
+        outBuffer.skip(outBuffer.available());
+        inBuffer.skip(inBuffer.available());
+    }
+
+    public TString getEncoding() {
+        return charsetName;
+    }
+
+    @Override
+    public void close() throws TIOException {
+        stream.close();
+    }
+
+    @Override
+    public int read() throws TIOException {
+        if (eof) {
+            return -1;
+        }
+        if (!outBuffer.end()) {
+            return outBuffer.get();
+        }
+        return fillBuffer() ? outBuffer.get() : -1;
+    }
+
+    @Override
+    public int read(char[] cbuf, int off, int len) throws TIOException {
+        CharBuffer wrapBuffer = new CharBuffer(cbuf, off, off + len);
+        while (!wrapBuffer.end()) {
+            wrapBuffer.put(outBuffer);
+            if (outBuffer.end() && !fillBuffer()) {
+                break;
+            }
+        }
+        return outBuffer.position() - off;
+    }
+
+    private boolean fillBuffer() throws TIOException {
+        if (eof) {
+            return false;
+        }
+        int i = 0;
+        while (!outBuffer.end()) {
+            outData[i++] = outBuffer.get();
+        }
+        outBuffer.rewind(i);
+        while (outBuffer.available() > 4) {
+            if (inBuffer.available() < 8 && !fillReadBuffer()) {
+                eof = true;
+                break;
+            }
+            charset.decode(inBuffer, outBuffer);
+        }
+        return true;
+    }
+
+    private boolean fillReadBuffer() throws TIOException {
+        if (streamEof) {
+            return false;
+        }
+        int off = 0;
+        while (!inBuffer.end()) {
+            inData[off] = inBuffer.get();
+        }
+        inBuffer.rewind(0);
+        while (off < inData.length) {
+            int bytesRead = stream.read(inData, off, inData.length - off);
+            if (bytesRead == -1) {
+                streamEof = true;
+                inBuffer = new ByteBuffer(inData, 0, inBuffer.position());
+                break;
+            } else {
+                off += bytesRead;
+            }
+        }
+        return true;
+    }
+
+    @Override
+    public boolean ready() throws TIOException {
+        return !outBuffer.end() || inBuffer.end();
+    }
+}
diff --git a/teavm-classlib/src/main/java/org/teavm/classlib/java/io/TReader.java b/teavm-classlib/src/main/java/org/teavm/classlib/java/io/TReader.java
new file mode 100644
index 000000000..7d028ba89
--- /dev/null
+++ b/teavm-classlib/src/main/java/org/teavm/classlib/java/io/TReader.java
@@ -0,0 +1,75 @@
+/*
+ *  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.io;
+
+import org.teavm.classlib.java.lang.TMath;
+import org.teavm.classlib.java.lang.TObject;
+
+/**
+ *
+ * @author Alexey Andreev
+ */
+public abstract class TReader implements TCloseable {
+    protected TObject lock;
+
+    protected TReader() {
+        this(new TObject());
+    }
+
+    protected TReader(TObject lock) {
+        this.lock = lock;
+    }
+
+    public int read() throws TIOException {
+        char[] buf = new char[1];
+        return read(buf) >= 0 ? buf[0] : -1;
+    }
+
+    public int read(char[] cbuf) throws TIOException {
+        return read(cbuf, 0, cbuf.length);
+    }
+
+    public abstract int read(char[] cbuf, int off, int len) throws TIOException;
+
+    public long skip(long n) throws TIOException {
+        char[] buffer = new char[1024];
+        long skipped = 0;
+        while (skipped < n) {
+            int charsRead = read(buffer, 0, (int)TMath.min(n, buffer.length));
+            if (charsRead < 0) {
+                break;
+            }
+            skipped += charsRead;
+        }
+        return skipped;
+    }
+
+    public boolean ready() throws TIOException {
+        return true;
+    }
+
+    public boolean markSupported() {
+        return false;
+    }
+
+    public void mark(@SuppressWarnings("unused") int readAheadLimit) throws TIOException {
+        throw new TIOException();
+    }
+
+    public void reset() throws TIOException {
+        throw new TIOException();
+    }
+}
diff --git a/teavm-classlib/src/main/java/org/teavm/classlib/java/lang/TMath.java b/teavm-classlib/src/main/java/org/teavm/classlib/java/lang/TMath.java
index cfdc08630..4b34b6b36 100644
--- a/teavm-classlib/src/main/java/org/teavm/classlib/java/lang/TMath.java
+++ b/teavm-classlib/src/main/java/org/teavm/classlib/java/lang/TMath.java
@@ -30,4 +30,12 @@ public final class TMath extends TObject {
     public static int max(int a, int b) {
         return a > b ? a : b;
     }
+
+    public static long min(long a, long b) {
+        return a < b ? a : b;
+    }
+
+    public static long max(long a, long b) {
+        return a > b ? a : b;
+    }
 }
diff --git a/teavm-html4j/src/test/java/org/teavm/html4j/test/KnockoutFXTest.java b/teavm-html4j/src/test/java/org/teavm/html4j/test/KnockoutFXTest.java
index 38d342969..da4212977 100644
--- a/teavm-html4j/src/test/java/org/teavm/html4j/test/KnockoutFXTest.java
+++ b/teavm-html4j/src/test/java/org/teavm/html4j/test/KnockoutFXTest.java
@@ -54,7 +54,9 @@ import net.java.html.BrwsrCtx;
 import net.java.html.js.JavaScriptBody;
 import org.apidesign.html.boot.spi.Fn;
 import org.apidesign.html.context.spi.Contexts;
+import org.apidesign.html.json.spi.Transfer;
 import org.apidesign.html.json.tck.KnockoutTCK;
+import org.netbeans.html.ko4j.KO4J;
 import org.testng.Assert;
 
 /**
@@ -93,8 +95,10 @@ public final class KnockoutFXTest extends KnockoutTCK {
 
     @Override
     public BrwsrCtx createContext() {
-        Contexts.Builder cb = Contexts.newBuilder();
-        return cb.build();
+        KO4J ko4j = new KO4J();
+        return Contexts.newBuilder()
+                .register(Transfer.class, ko4j.transfer(), 1)
+                .build();
     }
 
     @Override