How to increase Java heap space?

[fuomag9]

Hi, is there any way to pass java arguments for increasing java heap space? Currently mine crashes like this:

Creating output directory: /base-decompiled0000%) |
Output directory created: /base-decompiled
Running jadx on base.apk
INFO  - loading ...
ERROR - Process error:
java.lang.OutOfMemoryError: Java heap space
	at java.base/jdk.internal.misc.Unsafe.allocateUninitializedArray(Unsafe.java:1375)
	at java.base/java.lang.StringConcatHelper.newArray(StringConcatHelper.java:497)
	at java.base/java.lang.StringConcatHelper.newArrayWithSuffix(StringConcatHelper.java:475)
	at java.base/java.lang.invoke.DirectMethodHandle$Holder.invokeStatic(DirectMethodHandle$Holder)
	at java.base/java.lang.invoke.LambdaForm$MH/0x000000100100d000.invoke(LambdaForm$MH)
	at java.base/java.lang.invoke.LambdaForm$MH/0x000000100100e000.invoke(LambdaForm$MH)
	at java.base/java.lang.invoke.Invokers$Holder.linkToTargetMethod(Invokers$Holder)
	at jadx.core.utils.Utils.makeQualifiedObjectName(Utils.java:55)
	at jadx.core.codegen.TypeGen.signature(TypeGen.java:25)
	at jadx.core.dex.info.MethodInfo.makeShortId(MethodInfo.java:90)
	at jadx.core.dex.info.MethodInfo.<init>(MethodInfo.java:33)
	at jadx.core.dex.info.MethodInfo.fromRef(MethodInfo.java:52)
	at jadx.core.dex.nodes.MethodNode.<init>(MethodNode.java:92)
	at jadx.core.dex.nodes.MethodNode.build(MethodNode.java:86)
	at jadx.core.dex.nodes.ClassNode.lambda$load$1(ClassNode.java:126)
	at jadx.core.dex.nodes.ClassNode$$Lambda$217/0x00000010011c8000.apply(Unknown Source)
	at jadx.api.plugins.input.data.impl.ListConsumer.accept(ListConsumer.java:25)
	at jadx.plugins.input.dex.sections.DexClassData.readMethods(DexClassData.java:170)
	at jadx.plugins.input.dex.sections.DexClassData.visitMethods(DexClassData.java:145)
	at jadx.plugins.input.dex.sections.DexClassData.visitFieldsAndMethods(DexClassData.java:112)
	at jadx.core.dex.nodes.ClassNode.load(ClassNode.java:127)
	at jadx.core.dex.nodes.ClassNode.<init>(ClassNode.java:115)
	at jadx.core.dex.nodes.RootNode.lambda$loadClasses$0(RootNode.java:128)
	at jadx.core.dex.nodes.RootNode$$Lambda$212/0x00000010011be700.accept(Unknown Source)
	at jadx.plugins.input.dex.DexReader.visitClasses(DexReader.java:35)
	at jadx.plugins.input.dex.DexLoadResult.visitClasses(DexLoadResult.java:26)
	at jadx.core.dex.nodes.RootNode.loadClasses(RootNode.java:126)
	at jadx.api.JadxDecompiler.load(JadxDecompiler.java:125)
	at jadx.cli.JadxCLI.processAndSave(JadxCLI.java:51)
	at jadx.cli.JadxCLI.execute(JadxCLI.java:38)
	at jadx.cli.JadxCLI.main(JadxCLI.java:22)
Successfully decompiled base.apk with jadx

Indexing decompiled files in /base-decompiled/jadx...
Found 0 decompiled files for base.apk
Status: COMPLETE | Decompiled: 1/1 (100.000000%) |

Decompiling COMPLETE. Decompiled 1 files with 1 errors. Elapsed time: 0:00:32.582309

Status: COMPLETE | Decompiled: 1/1 (100.000000%) |
Found 0 new secrets (0 unique).
Decompiled 1 files with 1 errors in 0:00:32.582309.
Scanned 0 files and found 0 secrets in None.
Total Elapsed time: 0:00:32.592548

Output written to secrets_output.json

APKscan done. No secrets found.

[LucasFaudman]

Hi @fuomag9,

Thanks for your feedback! I saw your already closed this issue but wanted to provide a solution anyway for anyone else reading this.

Heap size is actually set by your environment's _JAVA_OPTIONS, not by APKscan, JADX, or any other dependancies.

To increase the heap space for a Java application and avoid java.lang.OutOfMemoryError: Java heap space, you can modify the _JAVA_OPTIONS environment variable to specify the desired heap size.

# Desired heap size ie: 1g = 1GB, 2g = 2GB, 4g = 4GB, 100m = 100MB, etc
heap_size="4g"
heap_size_arg="-Xmx$heap_size"

# Check if _JAVA_OPTIONS is set
if [ -z "$_JAVA_OPTIONS" ]; then
    export _JAVA_OPTIONS="$heap_size_arg"
else
    # Check if _JAVA_OPTIONS contains -Xmx
    if echo "$_JAVA_OPTIONS" | grep -q '\-Xmx'; then
        # Replace existing -Xmx value
        export _JAVA_OPTIONS=$(echo "$_JAVA_OPTIONS" | sed -E "s/\-Xmx[0-9]+[kKmMgG]/$heap_size_arg/")
    else
        # Add -Xmx value
        export _JAVA_OPTIONS="$_JAVA_OPTIONS $heap_size_arg"
    fi
fi

# Verify the setting
echo "Current _JAVA_OPTIONS: $_JAVA_OPTIONS"