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我收到來自Maven Surefire插件的NullPointerException。它僅在使用DBUnit的測試中發生。 Surefire報告文件是空的。JUnit runner從java.io.Writer獲取NullPointerException
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T E S T S
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org.apache.maven.surefire.booter.SurefireExecutionException: null; nested exception is java.lang.NullPointerException: null
java.lang.NullPointerException
at java.io.Writer.write(Writer.java:140)
at java.io.PrintWriter.newLine(PrintWriter.java:436)
at java.io.PrintWriter.println(PrintWriter.java:585)
at java.io.PrintWriter.println(PrintWriter.java:696)
at org.apache.maven.surefire.report.AbstractFileReporter.testSetStarting(AbstractFileReporter.java:59)
at org.apache.maven.surefire.report.ReporterManager.testSetStarting(ReporterManager.java:219)
at org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.executeTestSet(AbstractDirectoryTestSuite.java:138)
at org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.execute(AbstractDirectoryTestSuite.java:127)
at org.apache.maven.surefire.Surefire.run(Surefire.java:177)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.maven.surefire.booter.SurefireBooter.runSuitesInProcess(SurefireBooter.java:338)
at org.apache.maven.surefire.booter.SurefireBooter.main(SurefireBooter.java:997)
[INFO] ------------------------------------------------------------------------
[ERROR] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] There are test failures.
當我嘗試使用JUnit運行運行從NetBeans IDE中相同的測試,我得到相同的異常:
Exception in thread "main" java.lang.NullPointerException
at java.io.Writer.write(Writer.java:140)
at org.apache.tools.ant.util.DOMElementWriter.write(DOMElementWriter.java:212)
at org.apache.tools.ant.taskdefs.optional.junit.XMLJUnitResultFormatter.endTestSuite(XMLJUnitResultFormatter.java:171)
at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.fireEndTestSuite(JUnitTestRunner.java:714)
at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.run(JUnitTestRunner.java:547)
at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.launch(JUnitTestRunner.java:1031)
at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.main(JUnitTestRunner.java:888)
Test football.dao.jpa.SimpleJPATest FAILED (crashed)
從java.io.Writer中的類寫方法只有一個String參數。這意味着跑步者必須傳遞null作爲參數。但是,這是如何發生的?
public void write(String str) throws IOException {
write(str, 0, str.length());
}
+1,只是打敗了我。作爲參考,這可以從'PrintWriter.newLine'調用派生出來,它只是簡單地按照'out.write(lineSeparator)'的方式。 – 2010-11-19 16:55:55
謝謝! line.separator屬性確實爲null。我通過使用僅包含4個DBUnit屬性的Properties對象調用System.setProperties(props)來實現它。我不知道這種方法取代了所有的屬性。我應該更仔細地閱讀javadoc。再次感謝你們兩位! – prasopes 2010-11-19 17:36:58
太棒了!將背誦這個小惡魔訣竅 – mhaller 2010-11-19 19:19:02