MuntashirAkon/AppManager · error · IllegalArgumentException

Invalid format: isHidden not found

Error message

Invalid format: isHidden not found

What it means

MagiskDenyListRule's constructor reads the isHidden (enabled) boolean token after the package/process tokens. If the tokenizer has no more elements, it throws this IllegalArgumentException because a MAGISK_DENY_LIST rule is incomplete without the isHidden field.

Solutions

  1. Ensure the flattened string includes a "true"/"false" isHidden token after package and process names
  2. Check token count before constructing the rule and reject short strings
  3. Regenerate the rule export from the current AppManager version
  4. Catch IllegalArgumentException during import and skip/report malformed entries

Example fix

// before
new MagiskDenyListRule(pkg, proc, new StringTokenizer("com.example\tcom.example\tsub")); // throws
// after
new MagiskDenyListRule(pkg, proc, new StringTokenizer("com.example\tcom.example\tsub\tfalse\tfalse"));
Defensive patterns

Strategy: validation

Validate before calling

String[] p = line.split("\t");
if (p.length < 3) throw new IllegalArgumentException("MAGISK_DENY_LIST rule needs isHidden");
Boolean.parseBoolean(p[2]);

Type guard

boolean isParsableDenyListRule(String line) { String[] p = line.split("\t"); return p.length >= 3 && (p[2].equals("true") || p[2].equals("false")); }

Try / catch

try { new MagiskDenyListRule(pkg, proc, tokenizer); } catch (IllegalArgumentException e) { skipRule(line, e); }

Prevention

When it happens

Trigger: new MagiskDenyListRule(packageName, processName, tokenizer) invoked with a tokenizer that ran out of tokens before the isHidden boolean, i.e. the flattened string lacks the third field.

Common situations: Truncated or hand-edited deny-list rule exports, imports of rules from older AppManager versions with fewer fields, or wrong delimiter handling dropping tokens.

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

AI-assisted analysis of MuntashirAkon/AppManager@0152f468fc (2026-09-12). Data as JSON: /api/errors/be770cc7e4ecfa9b. Report an issue: GitHub.

Appendix: source

Thrown at app/src/main/java/io/github/muntashirakon/AppManager/rules/struct/MagiskDenyListRule.java:29

import io.github.muntashirakon.AppManager.rules.RuleType;

public class MagiskDenyListRule extends RuleEntry {
    @NonNull
    private final MagiskProcess mMagiskProcess;

    public MagiskDenyListRule(@NonNull MagiskProcess magiskProcess) {
        super(magiskProcess.packageName, magiskProcess.name, RuleType.MAGISK_DENY_LIST);
        mMagiskProcess = magiskProcess;
    }

    public MagiskDenyListRule(@NonNull String packageName, @NonNull String processName, @NonNull StringTokenizer tokenizer)
            throws IllegalArgumentException {
        super(packageName, processName, RuleType.MAGISK_DENY_LIST);
        mMagiskProcess = new MagiskProcess(packageName, name);
        mMagiskProcess.setAppZygote(name.endsWith("_zygote"));
        if (tokenizer.hasMoreElements()) {
            mMagiskProcess.setEnabled(Boolean.parseBoolean(tokenizer.nextElement().toString()));
        } else throw new IllegalArgumentException("Invalid format: isHidden not found");
        if (tokenizer.hasMoreElements()) {
            mMagiskProcess.setIsolatedProcess(Boolean.parseBoolean(tokenizer.nextElement().toString()));
        }
    }

    public String getProcessName() {
        return name;
    }

    @NonNull
    public MagiskProcess getMagiskProcess() {
        return mMagiskProcess;
    }

    @NonNull
    @Override
    public String toString() {
        return "MagiskDenyListRule{" +

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