> java_troubleshooting
java
Java runtime + JVM exceptions.
6 errors·category: language·updated june 2026
#codeproblemseveritypopularity
- 01NullPointerExceptionNullPointerException: Cannot invoke method on nullcritical98
- 02StackOverflowErrorStackOverflowError: thread call stack exhaustedcritical92
- 03ArrayIndexOutOfBoundsExceptionArrayIndexOutOfBoundsException: index out of rangecritical87
- 04ClassNotFoundExceptionClassNotFoundException: cannot find class at runtimecritical85
- 05NumberFormatExceptionNumberFormatException: invalid numeric stringworkaround83
- 06OutOfMemoryErrorJava heap space out of memoryworkaround79
> advertisementAdSense placeholder
> methodology
- · Cross-referenced with the official java docs and GitHub issues.
- · Fixes verified against top-voted Stack Overflow answers and high-reaction GitHub comments.
- · Reviewed and refreshed as new java versions ship and reader corrections come in.
- · No paid placements. No third-party affiliate links. Monetisation: AdSense plus occasional links to the editor’s own paid digital products (clearly labelled).
// other_stacks