iBotPeaches/Apktool · error · XmlPullParserException

Could not initialize parser.

Error message

Could not initialize parser.

What it means

Wrapper exception: setInput() converts any IOException raised during initial AXML chunk reading (empty input [30], wrong first chunk [31], stream failure) into a standard XmlPullParserException with this message, resetting parser state. The real cause is attached as the chained exception.

Source

Thrown at brut.apktool/apktool-lib/src/main/java/brut/androlib/res/decoder/BinaryXmlResourceParser.java:124

    public void setInput(InputStream inputStream, String inputEncoding) throws XmlPullParserException {
        if (inputEncoding != null) {
            throw new XmlPullParserException(NOT_SUPPORTED);
        }

        reset();
        mIn = new BinaryDataInputStream(new BufferedInputStream(inputStream));
        mParser = new ResChunkPullParser(mIn);
        try {
            if (!nextChunk()) {
                throw new IOException("Input file is empty.");
            }
            if (mParser.chunkType() != ResChunkHeader.RES_XML_TYPE) {
                throw new IOException("Unexpected chunk: " + mParser.chunkName() + " (expected: RES_XML_TYPE)");
            }
        } catch (IOException ex) {
            mIn = null;
            mParser = null;
            throw new XmlPullParserException("Could not initialize parser.", this, ex);
        }

        mParser = new ResChunkPullParser(mIn, mParser.dataSize());
    }

    @Override
    public String getInputEncoding() {
        return null;
    }

    @Override
    public void defineEntityReplacementText(String entityName, String replacementText) throws XmlPullParserException {
        throw new XmlPullParserException(NOT_SUPPORTED);
    }

    @Override
    public int getNamespaceCount(int depth) {
        return mNamespaces.getCount(depth);

View on GitHub (pinned to 79b63384d7)

Solutions

1. Unwrap the cause: `ex.getCause()` reveals 'Input file is empty.' or 'Unexpected chunk: ...' — follow the fix for [30] or [31].
2. Validate the AXML magic bytes (0x0003) and non-zero size before calling setInput.
3. Ensure the InputStream is open and positioned at 0 (not reused after a prior read).
4. Re-obtain the APK/file if the cause indicates truncation.

Example fix

try {
    parser.setInput(in, null);
} catch (XmlPullParserException e) {
    Throwable root = e.getCause();
    log.error("AXML init failed: {}", root != null ? root.getMessage() : e.getMessage());
    throw e;
}

if (inputStream == null) throw new IllegalArgumentException("null stream");
if (file != null && file.length() < 8) throw new IllegalArgumentException("AXML too small");

try {
    parser.setInput(in, null);
} catch (XmlPullParserException e) {
    Throwable cause = e.getCause();
    if (cause instanceof IOException) {
        // empty input, wrong chunk type, or stream failure — see [30]/[31]
    }
}

When it happens

Trigger: Any of the conditions in [30]/[31], or a low-level read failure on the InputStream during initialization — e.g. stream already closed, network stream dropped.

Common situations: Callers using the XmlPullParser API generically see this instead of the raw IOException; typical roots are empty/corrupt AXML files or non-AXML input routed to the binary parser.

Related errors

• Input file is empty.
• Unexpected chunk:
• Parser must be on START_TAG to read next text.
• Parser must be on TEXT or END_TAG to read text.
• Event TEXT must be immediately followed by END_TAG.

AI-assisted analysis of iBotPeaches/Apktool@79b63384d7 (2026-08-14). Data as JSON: /api/errors/f1de96f75736a43e. Report an issue: GitHub.