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PMD is a tool that looks for potential problems like possible bugs, dead code, suboptimal code, overcomplicated expressions or duplicate code.

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In JUnit 3, the tearDown method was used to clean up all data entities required in running tests. 
JUnit 4 skips the tearDown method and executes all methods annotated with @After after running each test Example: 
public class MyTest {
    public void tearDown() {
        bad();
    }
}
public class MyTest2 {
    @After public void tearDown() {
        good();
    }
}