{"record":{"id":"0c96b46e28a82283","repo":"MuntashirAkon/AppManager","slug":"premature-end-of-tar-archive-didn-t-find-any-entry-after-pax","errorCode":null,"errorMessage":"premature end of tar archive. Didn't find any entry after PAX header.","messagePattern":"premature end of tar archive\\. Didn't find any entry after PAX header\\.","errorType":"exception","errorClass":"IOException","httpStatus":null,"severity":"error","filePath":"app/src/main/java/org/apache/commons/compress/archivers/tar/TarArchiveInputStream.java","lineNumber":600,"sourceCode":"     *\n     * For PAX Format 1.X:\n     * The sparse map itself is stored in the file data block, preceding the actual file data.\n     * It consists of a series of decimal numbers delimited by newlines. The map is padded with nulls to the nearest block boundary.\n     * The first number gives the number of entries in the map. Following are map entries, each one consisting of two numbers\n     * giving the offset and size of the data block it describes.\n     * @throws IOException\n     */\n    private void paxHeaders() throws IOException {\n        List<TarArchiveStructSparse> sparseHeaders = new ArrayList<>();\n        final Map<String, String> headers = TarUtils.parsePaxHeaders(this, sparseHeaders, globalPaxHeaders, entrySize);\n\n        // for 0.1 PAX Headers\n        if (headers.containsKey(\"GNU.sparse.map\")) {\n            sparseHeaders = TarUtils.parsePAX01SparseHeaders(headers.get(\"GNU.sparse.map\"));\n        }\n        getNextEntry(); // Get the actual file entry\n        if (currEntry == null) {\n            throw new IOException(\"premature end of tar archive. Didn't find any entry after PAX header.\");\n        }\n        applyPaxHeadersToCurrentEntry(headers, sparseHeaders);\n\n        // for 1.0 PAX Format, the sparse map is stored in the file data block\n        if (currEntry.isPaxGNU1XSparse()) {\n            sparseHeaders = TarUtils.parsePAX1XSparseHeaders(inputStream, recordSize);\n            currEntry.setSparseHeaders(sparseHeaders);\n        }\n\n        // sparse headers are all done reading, we need to build\n        // sparse input streams using these sparse headers\n        buildSparseInputStreams();\n    }\n\n    private void applyPaxHeadersToCurrentEntry(final Map<String, String> headers, final List<TarArchiveStructSparse> sparseHeaders) {\n        currEntry.updateEntryFromPaxHeaders(headers);\n        currEntry.setSparseHeaders(sparseHeaders);\n    }","sourceCodeStart":582,"sourceCodeEnd":618,"githubUrl":"https://github.com/MuntashirAkon/AppManager/blob/0152f468fc9463ee02dc2ca83f6fe4989a2c4ca5/app/src/main/java/org/apache/commons/compress/archivers/tar/TarArchiveInputStream.java#L582-L618","documentation":"Thrown by paxHeaders() when, after reading a per-file PAX extended header (typeflag 'x'), the next call to getNextEntry() returns null — meaning the archive ended without the real entry that the PAX header describes.","triggerScenarios":"A PAX 'x' header block is followed by end-of-archive markers or EOF instead of the actual file entry — typically a truncated download or a tar cut short while being written.","commonSituations":"Interrupted downloads/uploads; streaming a tar that is still being produced; archives truncated by disk-full during copy.","solutions":["Verify the archive is complete (size/hash check) and re-download if not","Only read archives after the producer has finished writing them","Catch IOException around getNextTarEntry and report a truncated archive","Re-create the archive with GNU tar/bsdtar if the source is known-bad"],"exampleFix":"// before\nTarArchiveEntry e = tin.getNextTarEntry();\n// after\ntry {\n    TarArchiveEntry e = tin.getNextTarEntry();\n    // process\n} catch (IOException ex) {\n    throw new IOException(\"Truncated archive: entry missing after PAX header\", ex);\n}","handlingStrategy":"try-catch","validationCode":null,"typeGuard":null,"tryCatchPattern":"try {\n    while ((e = tin.getNextTarEntry()) != null) { process(e); }\n} catch (IOException e) {\n    if (e.getMessage() != null && e.getMessage().contains(\"premature end\")) {\n        throw new IOException(\"Archive truncated after PAX header\", e);\n    }\n    throw e;\n}","preventionTips":["Verify archive size/hash before extraction","Read only after the producer closes the file","Handle EOF markers (two zero blocks) correctly in custom writers"],"tags":["tar","pax-header","truncation"],"backgroundTag":"truncated-archive","analyzedSha":"0152f468fc9463ee02dc2ca83f6fe4989a2c4ca5","analyzedAt":"2026-09-12T14:03:37.243Z","contentChangedAt":"2026-09-12T14:03:37.243Z","schemaVersion":2},"datasetVersion":"2026-09-23T08:17:48.524Z"}