MuntashirAkon/AppManager · error · IOException

Cannot write more data, the end of the compressed data…

Error message

Cannot write more data, the end of the compressed data stream has been reached

What it means

GzipCompressorOutputStream.write throws this IOException when the underlying Deflater has already finished the compressed stream (finish()/close() was called). After the GZIP trailer is written, no further input can be compressed, so any subsequent write is rejected.

Solutions

Move all write() calls before finish()/close()
Do not call finish() until all data is written; buffer remaining data first
Use a new GzipCompressorOutputStream for additional data
Restructure code so try-with-resources scope covers all writes

Example fix

// before
gzipOut.finish();
gzipOut.write(moreData); // throws
// after
gzipOut.write(moreData);
gzipOut.finish();

Defensive patterns

Strategy: try-catch

Validate before calling

if (gzipOut == null || ((GzipCompressorOutputStream) gzipOut).isClosed()) throw new IllegalStateException("gzip stream already finished/closed");

Type guard

boolean canWrite(GzipCompressorOutputStream s) { return s != null && !s.isClosed(); }

Try / catch

try { gzipOut.write(data); } catch (IOException e) { if (e.getMessage().contains("end of the compressed data stream")) { /* reopen stream or drop data */ } else throw e; }

Prevention

Write all data before calling finish()/close()
Scope try-with-resources to cover every write
Never reuse a GzipCompressorOutputStream after finish()

When it happens

Trigger: Calling write(byte[],int,int), write(int), or write(byte[]) on a GzipCompressorOutputStream after finish() or close() has been invoked, or after deflater.finished() became true.

Common situations: Reusing an output stream variable after try-with-resources closed it; calling finish() then continuing to write in a chunked-upload loop; accidentally closing the gzip stream while wrapping code still holds a reference.

Understand the failure class

Background: "Invalid state transition" errors: "status must be X, actually Y", "already rejected/charging/uninstalled", "cannot ... while running" — what they mean when a library rejects your call — this error's family across 31 libraries.

Related errors

AI-assisted analysis of MuntashirAkon/AppManager@0152f468fc (2026-09-12). Data as JSON: /api/errors/84a739cbc052f4e6. Report an issue: GitHub.

Appendix: source

Thrown at app/src/main/java/org/apache/commons/compress/compressors/gzip/GzipCompressorOutputStream.java:141

    /**
     * {@inheritDoc}
     *
     * @since 1.1
     */
    @Override
    public void write(final byte[] buffer) throws IOException {
        write(buffer, 0, buffer.length);
    }

    /**
     * {@inheritDoc}
     *
     * @since 1.1
     */
    @Override
    public void write(final byte[] buffer, final int offset, final int length) throws IOException {
        if (deflater.finished()) {
            throw new IOException("Cannot write more data, the end of the compressed data stream has been reached");
        }
        if (length > 0) {
            deflater.setInput(buffer, offset, length);

            while (!deflater.needsInput()) {
                deflate();
            }

            crc.update(buffer, offset, length);
        }
    }

    private void deflate() throws IOException {
        final int length = deflater.deflate(deflateBuffer, 0, deflateBuffer.length);
        if (length > 0) {
            out.write(deflateBuffer, 0, length);
        }
    }

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