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EXPLICIT_GC_CALL

Summary

  • Rule ID: EXPLICIT_GC_CALL
  • Name: Explicit GC call
  • Problem: Explicit GC calls in application/library code are usually unnecessary and can reduce runtime predictability.

What This Rule Reports

This rule reports direct calls to explicit GC APIs in analysis target classes: - java/lang/System.gc()V - java/lang/Runtime.gc()V

Examples (reported)

package com.example;
public class ClassA {
    public void methodX() {
        System.gc();
    }
}

package com.example;
public class ClassB {
    public void methodY() {
        Runtime.getRuntime().gc();
    }
}

What This Rule Does Not Report

  • Non-GC System APIs (for example System.lineSeparator()).
  • Calls that appear only in classpath/dependency classes outside the analysis target.

Examples (not reported)

package com.example;
public class ClassC {
    public String methodZ() {
        return System.lineSeparator();
    }
}

Remove explicit GC calls and let the JVM manage garbage collection; tune GC behavior through JVM options if needed.

Message Shape

Findings are reported as Avoid explicit GC call in <class>.<method><descriptor>; let the JVM manage garbage collection.