Question 1

How to fix out of memory errors in Bytecode Viewer?

Accepted Answer

Increase the Java heap space by running BCV with the -Xmx flag, e.g., 'java -Xmx3G -jar BCV.jar', as specified in the README under 'Java Heap Space Issues'. This is common when analyzing large APKs or JARs.

Question 2

Bytecode Viewer vs JADX: which is better for Android reverse engineering?

Accepted Answer

Bytecode Viewer integrates JADX as one of multiple decompilers, offering versatility for comparison, but standalone JADX is more focused and faster for pure Android APK analysis. BCV is better for multi-tool workflows, while JADX excels in speed and Android-specific features.

Question 3

Can Bytecode Viewer handle obfuscated code effectively?

Accepted Answer

Yes, but effectiveness varies with obfuscation techniques. BCV's multiple decompilers can help, but severe obfuscation may require custom plugins or manual intervention, as the built-in tools have limitations against advanced obfuscation.

Question 4

How to write a custom plugin for Bytecode Viewer?

Accepted Answer

Use the built-in Plugin Writer or write Java/JavaScript scripts that interact with ClassNode arrays via ASM. The README explains that plugins execute with loaded classfiles, allowing for automated analysis like string deobfuscation.

Question 5

Is Bytecode Viewer free for commercial use?

Accepted Answer

Yes, it's open-source under a copyleft license (likely GPL, as indicated in the Links section), but ensure compliance with license terms for derived works, as redistribution might require source code sharing.

Question 6

How to export decompiled code from Bytecode Viewer?

Accepted Answer

BCV supports exporting as runnable JAR, ZIP, APK, or decompiled archives via the UI or command-line options like -o for output files, making it easy to save and share analysis results.

Bytecode Viewer

What is Bytecode Viewer?

Overview

Use Cases

Best For

Related Projects

Found a gem we're missing?

Not Ideal For

Pros & Cons

Pros

Cons

Frequently Asked Questions