我从 Maven Surefire 插件收到 NullPointerException。它只发生在使用 DBUnit 的测试上。Surefire 报告文件为空。
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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.
当我尝试使用 JUnit 运行器从 NetBeans IDE 运行相同的测试时,我得到了相同的异常:
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)
java.io.Writer 类的write方法只有一个 String 参数。这意味着跑步者必须将 null 作为参数传递。但这是怎么发生的?
public void write(String str) throws IOException {
write(str, 0, str.length());
}