pxb1988/dex2jar · error · DexException

while accept code in method

Error message

while accept code in method:[%s] @%08x

What it means

DexException thrown when decoding a method's bytecode body fails. acceptCode() parses insns, try/catch blocks, debug info and labels for the method at code_off, and any exception inside is re-wrapped with the method name and code offset (@%08x) for diagnosis.

Solutions

1. Read the cause and the @%08x offset to locate the failing code item in the dex
2. Upgrade dex-translator/d2j to a version supporting the dex/opcode version in use
3. Validate the dex with a checker (dexlint/dexdump) before conversion
4. Catch DexException around accept() to skip the offending method and continue

Example fix

// before
reader.accept(dmv);
// after
try {
    reader.accept(dmv);
} catch (DexException e) {
    System.err.println("bad code: " + e.getMessage());
}

// Pre-check with external validator
Process p = Runtime.getRuntime().exec(new String[]{"dexdump", "-d", dexPath});
// fail early if dexdump reports malformed code items

try {
    reader.accept(dmv);
} catch (DexException e) {
    logger.warn("bad method code: " + e.getMessage());
}

When it happens

Trigger: accept() encounters code_off != 0 and calls acceptCode(); the code item references invalid registers, unknown opcodes, truncated insns arrays, or malformed try/catch/debug structures.

Common situations: Converting dex files built by non-standard compilers, multidex with corrupted entries, dexes that use newer opcodes than this d2j version understands, or deliberately malformed files.

Understand the failure class

Background: "Invalid ... format", "must be in format X", "does not look like a ..." — invalid argument format errors across CLI tools and libraries — this error's family across 17 libraries.

Related errors

• zero-width instruction op=0x%02x
• Invalid extended opcode encountered
• while accept parameter annotation in method
• while accept method:[ ]
• While accepting parameter annotation in parameter

AI-assisted analysis of pxb1988/dex2jar@b5bda4fb49 (2026-09-08). Data as JSON: /api/errors/2f5b0b66855e46da. Report an issue: GitHub.

Appendix: source

Thrown at dex-reader/src/main/java/com/googlecode/d2j/reader/DexFileReader.java:1067

                        } catch (Exception e) {
                            throw new DexException(e, "while accept parameter annotation in method:%s.",
                                    method.toString());
                        }
                    }
                }
                if (code_off != 0) {
                    boolean keep = true;
                    if (0 != (SKIP_CODE & config)) {
                        keep = 0 != (KEEP_CLINIT & config) && method.getName().equals("<clinit>");
                    }
                    if(keep) {
                        DexCodeVisitor dcv = dmv.visitCode();
                        if (dcv != null) {
                            try {
                                acceptCode(code_off, dcv, config, (method_access_flags & DexConstants.ACC_STATIC) != 0,
                                        method);
                            } catch (Exception e) {
                                throw new DexException(e, "while accept code in method:[%s] @%08x", method.toString(),
                                        code_off);
                            }
                        }
                    }
                }
                dmv.visitEnd();
            }
        } catch (Exception e) {
            throw new DexException(e, "while accept method:[%s]", method.toString());
        }

        return method_id;
    }

    private void read_annotation_set_ref_list(int parameter_annotation_offset, DexMethodVisitor dmv) {
        ByteBuffer in = annotationSetRefListIn;
        in.position(parameter_annotation_offset);

View on GitHub (pinned to b5bda4fb49)