pxb1988/dex2jar · error · RuntimeException

not support access flags " + name

Error message

not support access flags " + name

What it means

The Jasmin grammar's access-flag lookup maps textual flags (public, final, enum, super, annotation, ...) to ASM Opcodes bits. An unrecognized flag name throws RuntimeException('not support access flags <name>').

Solutions

  1. Remove or replace the unsupported flag with a mapped one (public/private/protected/static/final/super/interface/abstract/annotation/enum/synthetic, etc.)
  2. Check spelling/case of the flag in the .j file
  3. Add a mapping branch in getAccessFlag if you need the flag and control the grammar

Example fix

// before
.class public strictfp Foo
// after
.class public Foo
Defensive patterns

Strategy: validation

Validate before calling

static final Set<String> VALID = Set.of("public","private","protected","static","final","super","interface","abstract","synthetic","annotation","enum");
if (!VALID.contains(flag)) throw new IllegalArgumentException("unsupported flag: " + flag);

Prevention

When it happens

Trigger: A .j file contains an access-flag token the parser does not know, e.g. '.class public strictfp' or misspelled/legacy flags like 'synchronized' on class or 'transient' where unsupported.

Common situations: Jasmin files generated for older/newer jasmin dialects using flags this grammar doesn't recognize; typos ('pubic', 'Privat'); flags valid in Java but not mapped in this grammar.

Understand the failure class

Background: Invalid enum value errors: "Unknown type", "Invalid scope", "must be one of" — when a string is not on the library's allowed list — this error's family across 23 libraries.

Related errors

AI-assisted analysis of pxb1988/dex2jar@b5bda4fb49 (2026-09-08). Data as JSON: /api/errors/13a28da8f70339e3. Report an issue: GitHub.

Appendix: source

Thrown at d2j-jasmin/src/main/antlr3/com/googlecode/d2j/jasmin/Jasmin.g:271

            return ACC_NATIVE;
        } else if (name.equals("interface")) {
            return ACC_INTERFACE;
        } else if (name.equals("abstract")) {
            return ACC_ABSTRACT;
        } else if (name.equals("strict")) {
            return ACC_STRICT;
        } else if (name.equals("strictfp")) {
            return ACC_STRICT;
        } else if (name.equals("synthetic")) {
            return ACC_SYNTHETIC;
        } else if (name.equals("annotation")) {
            return ACC_ANNOTATION;
        } else if (name.equals("enum")) {
            return ACC_ENUM;
        } else if (name.equals("super")) {
            return ACC_SUPER;
        }
        throw new RuntimeException("not support access flags " + name);
    }
    private static int getOp(String str) {
            switch (str) {
            case "nop":
                return Opcodes.NOP;
            case "aconst_null":
                return Opcodes.ACONST_NULL;
            case "iconst_m1":
                return Opcodes.ICONST_M1;
            case "iconst_0":
                return Opcodes.ICONST_0;
            case "iconst_1":
                return Opcodes.ICONST_1;
            case "iconst_2":
                return Opcodes.ICONST_2;
            case "iconst_3":
                return Opcodes.ICONST_3;
            case "iconst_4":

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