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NoNullForCollectionReturnCheck: NPE on constructor with return in it #573

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rnveach opened this Issue May 12, 2017 · 1 comment

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rnveach commented May 12, 2017

Identified in Issue #571

$ cat TestClass.java
public class TestClass {
    public String[] method() {
        return null;
    }

    TestClass() {
        if (true) {
            return;
        }
    }
}

$ cat TestConfig.xml
<?xml version="1.0"?>
<!DOCTYPE module PUBLIC
          "-//Puppy Crawl//DTD Check Configuration 1.3//EN"
          "http://www.puppycrawl.com/dtds/configuration_1_3.dtd">

<module name="Checker">
    <property name="charset" value="UTF-8"/>

    <module name="TreeWalker">
<module name="com.github.sevntu.checkstyle.checks.coding.NoNullForCollectionReturnCheck"/>
    </module>
</module>

$ java -jar checkstyle-7.3-sevntu-1.23.0-all.jar -c TestConfig.xml TestClass.java
Starting audit...
com.puppycrawl.tools.checkstyle.api.CheckstyleException: Exception was thrown while processing TestClass.java
    at com.puppycrawl.tools.checkstyle.Checker.processFiles(Checker.java:287)
    at com.puppycrawl.tools.checkstyle.Checker.process(Checker.java:205)
    at com.puppycrawl.tools.checkstyle.Main.runCheckstyle(Main.java:425)
    at com.puppycrawl.tools.checkstyle.Main.runCli(Main.java:359)
    at com.puppycrawl.tools.checkstyle.Main.main(Main.java:174)
Caused by: java.lang.NullPointerException
    at com.github.sevntu.checkstyle.checks.coding.NoNullForCollectionReturnCheck.getMethodDef(NoNullForCollectionReturnCheck.java:355)
    at com.github.sevntu.checkstyle.checks.coding.NoNullForCollectionReturnCheck.visitToken(NoNullForCollectionReturnCheck.java:147)
    at com.puppycrawl.tools.checkstyle.TreeWalker.notifyVisit(TreeWalker.java:361)
    at com.puppycrawl.tools.checkstyle.TreeWalker.processIter(TreeWalker.java:498)
    at com.puppycrawl.tools.checkstyle.TreeWalker.walk(TreeWalker.java:303)
    at com.puppycrawl.tools.checkstyle.TreeWalker.processFiltered(TreeWalker.java:178)
    at com.puppycrawl.tools.checkstyle.api.AbstractFileSetCheck.process(AbstractFileSetCheck.java:78)
    at com.puppycrawl.tools.checkstyle.Checker.processFile(Checker.java:307)
    at com.puppycrawl.tools.checkstyle.Checker.processFiles(Checker.java:278)
    ... 4 more
Checkstyle ends with 1 errors.
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romani May 13, 2017

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fix is merged

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romani commented May 13, 2017

fix is merged

@romani romani closed this May 13, 2017

kariem added a commit to kariem/sevntu.checkstyle that referenced this issue Jul 26, 2018

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