pxb1988/dex2jar · error · RuntimeException

can't get owner and type from '"+str+"'

Error message

can't get owner and type from '"+str+"'

What it means

Jasmin.g's parseOwnerAndName splits a 'owner/name' string at the last '/'. If the string contains no '/' at index > 0, it cannot derive owner and name and throws RuntimeException("can't get owner and type from '<str>'").

Solutions

1. Write the reference in owner/name form: fully-qualified-class/member-name, e.g. 'java/lang/System/out'
2. Verify the token generation includes the class owner before the final '/'
3. Add a guard upstream to reject/repair tokens lacking a slash

Example fix

// before
.field foo I
// after
.field com/example/Foo/foo I

if (ref == null || ref.lastIndexOf('/') <= 0) throw new IllegalArgumentException("expected owner/name: " + ref);

When it happens

Trigger: Directives expecting a field/method reference like 'owner/name' (e.g. .field or invoke argument tokens) receiving a bare name without a slash, e.g. 'foo' instead of 'com/x/Foo/bar'.

Common situations: Hand-written .j files omitting the class prefix; generators that lost the owner part; escaped names whose only slash is at index 0.

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

• Fail to assemble
• can't pase string
• not support access flags " + name
• RecognitionException on invalid annotation element keyword…
• RecognitionException on invalid annotation element keyword…

AI-assisted analysis of pxb1988/dex2jar@b5bda4fb49 (2026-09-08). Data as JSON: /api/errors/a46abf2ec4afff71. Report an issue: GitHub.

Appendix: source

Thrown at d2j-jasmin/src/main/antlr3/com/googlecode/d2j/jasmin/Jasmin.g:680

                return 74;
            case "astore_0":
                return 75;
            case "astore_1":
                return 76;
            case "astore_2":
                return 77;
            case "astore_3":
                return 78;
            }
            return 0;
        }

    private String[] parseOwnerAndName(String str) {
        int x=str.lastIndexOf('/');
        if(x>0){
        return new String[]{ unEscape0(str,0,x), unEscape0(str,x+1,str.length()) };
        }
        throw new RuntimeException("can't get owner and type from '"+str+"'");
    }

    public Object parseValue(String desc, Object v) {
        switch(desc) {
        case "Z": return ((Number)v).intValue()!=0;
        case "B": return ((Number)v).byteValue();
        case "S": return ((Number)v).shortValue();
        case "I": return ((Number)v).intValue();
        case "F": return ((Number)v).floatValue();
        case "D": return ((Number)v).doubleValue();
        case "J": return ((Number)v).longValue();
        case "C": return (char)((Number)v).intValue();
        }
        return v;
    }

    static class AV {
        public AnnotationNode visitAnnotation(final String desc, final boolean visible) {

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