Java 使用EvoSuite时出现NullPointerException

我尝试使用新的EvoSuite（0.1.1），但是失败了，出现以下异常。我试过几门课，但结果通常是一样的。有时它能够毫无例外地完成。我使用的是Ubuntu14.0464位Java 8。-projectCP参数是正确的。我已经附上了一个更简单的一代和削减输出

命令：

java -jar ../../sette-tool/test-generator-tools/evosuite/evosuite.jar -projectCP build -generateTests -Dsearch_budget=10 -class hu.bme.mit.sette.snippets._1_basic.B2_conditionals.B2a_IfElse

输出：

* EvoSuite 
* Going to generate test cases for class: hu.bme.mit.sette.snippets._1_basic.B2_conditionals.B2a_IfElse
* Starting client
* Connecting to master process on port 12480
* Analyzing classpath: 
  - build
* Finished analyzing classpath
* Generating tests for class hu.bme.mit.sette.snippets._1_basic.B2_conditionals.B2a_IfElse
* Test criteria:
  - Line Coverage
  - Branch Coverage
  - Exception
  - Mutation testing (weak)
  - Method-Output Coverage
  - Top-Level Method Coverage
* Setting up search algorithm for individual test generation
* Total number of test goals: 
  - Line 55
  - Branch 82
  - Exception 0
  - MutationFactory 333
  - Output 18
  - Method 6
* Total number of test goals: 494
* Budget: 10

! Budget exceeded
* GA-Budget:
    - MaxTime :               1,431,415,037 / 10           Finished!
    - GlobalTime :                      16 / 600         
! #Goals that were not covered: 125
* Search finished after 14s, 11 statements, best individual has fitness 145.43707410246085
* Covered 369/494 goals
* Coverage of criterion LINE: 73%
* Number of covered goals: 40
* Coverage of criterion BRANCH: 77%
* Number of covered goals: 63
* Coverage of criterion EXCEPTION: 100% (no goals)
* Coverage of criterion WEAKMUTATION: 74%
* Number of covered goals: 248
* Coverage of criterion OUTPUT: 67%
* Number of covered goals: 12
* Coverage of criterion METHOD: 100%
* Number of covered goals: 6
* Resulting test suite: 2 tests, length 37
* Computation finished
[MASTER] 09:17:17.601 [pool-1-thread-2] ERROR ClientNodeImpl - Error when generating tests for: hu.bme.mit.sette.snippets._1_basic.B2_conditionals.B2a_IfElse with seed 1431415019886. Configuration id : null
java.lang.NullPointerException: null
    at org.evosuite.ga.Chromosome.getNumOfNotCoveredGoals(Chromosome.java:415) ~[evosuite.jar:na]
    at org.evosuite.statistics.SearchStatistics$IBranchGoalsSequenceOutputVariableFactory.getValue(SearchStatistics.java:517) ~[evosuite.jar:na]
    at org.evosuite.statistics.SearchStatistics$IBranchGoalsSequenceOutputVariableFactory.getValue(SearchStatistics.java:509) ~[evosuite.jar:na]
    at org.evosuite.statistics.SequenceOutputVariableFactory.update(SequenceOutputVariableFactory.java:39) ~[evosuite.jar:na]
    at org.evosuite.statistics.SearchStatistics.currentIndividual(SearchStatistics.java:159) ~[evosuite.jar:na]
    at org.evosuite.rmi.service.MasterNodeImpl.evosuite_collectStatistics(MasterNodeImpl.java:145) ~[evosuite.jar:na]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_45]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_45]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_45]
    at java.lang.reflect.Method.invoke(Method.java:497) ~[na:1.8.0_45]
    at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:323) ~[na:1.8.0_45]
    at sun.rmi.transport.Transport$1.run(Transport.java:200) ~[na:1.8.0_45]
    at sun.rmi.transport.Transport$1.run(Transport.java:197) ~[na:1.8.0_45]
    at java.security.AccessController.doPrivileged(Native Method) ~[na:1.8.0_45]
    at sun.rmi.transport.Transport.serviceCall(Transport.java:196) ~[na:1.8.0_45]
    at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:568) ~[na:1.8.0_45]
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:826) ~[na:1.8.0_45]
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$241(TCPTransport.java:683) ~[na:1.8.0_45]
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler$$Lambda$8/1383432533.run(Unknown Source) ~[na:na]
    at java.security.AccessController.doPrivileged(Native Method) ~[na:1.8.0_45]
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682) ~[na:1.8.0_45]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_45]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_45]
    at java.lang.Thread.run(Thread.java:745) [na:1.8.0_45]
    at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:276) ~[na:1.8.0_45]
    at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:253) ~[na:1.8.0_45]
    at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:162) ~[na:1.8.0_45]
    at java.rmi.server.RemoteObjectInvocationHandler.invokeRemoteMethod(RemoteObjectInvocationHandler.java:194) ~[na:1.8.0_45]
    at java.rmi.server.RemoteObjectInvocationHandler.invoke(RemoteObjectInvocationHandler.java:148) ~[na:1.8.0_45]
    at com.sun.proxy.$Proxy9.evosuite_collectStatistics(Unknown Source) ~[na:na]
    at org.evosuite.rmi.service.ClientNodeImpl.updateStatistics(ClientNodeImpl.java:219) ~[evosuite.jar:na]
    at org.evosuite.statistics.StatisticsSender.sendIndividualToMaster(StatisticsSender.java:46) ~[evosuite.jar:na]
    at org.evosuite.statistics.StatisticsSender.executedAndThenSendIndividualToMaster(StatisticsSender.java:76) ~[evosuite.jar:na]
    at org.evosuite.TestSuiteGenerator.generateTests(TestSuiteGenerator.java:470) ~[evosuite.jar:na]
    at org.evosuite.TestSuiteGenerator.generateTestSuite(TestSuiteGenerator.java:252) ~[evosuite.jar:na]
    at org.evosuite.rmi.service.ClientNodeImpl$1.run(ClientNodeImpl.java:125) ~[evosuite.jar:na]
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_45]
    at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_45]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_45]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_45]
    at java.lang.Thread.run(Thread.java:745) [na:1.8.0_45]

课程编号：

public final class B1b_Constants {
    private B1b_Constants() {
        throw new UnsupportedOperationException("Static class");
    }

    public static final boolean CONST_BOOLEAN = true;
    public static final byte CONST_BYTE = 123;
    public static final short CONST_SHORT = 12345;
    public static final int CONST_INT = 1234567890;
    public static final long CONST_LONG = 1234567890123456789L;
    public static final float CONST_FLOAT = 12345.67890f;
    public static final double CONST_DOUBLE = 1.2345678e90;
    public static final char CONST_CHAR = 'C';

    public static boolean constBoolean() {
        return B1b_Constants.CONST_BOOLEAN;
    }

    public static byte constByte() {
        return B1b_Constants.CONST_BYTE;
    }

    public static short constShort() {
        return B1b_Constants.CONST_SHORT;
    }

    public static int constInt() {
        return B1b_Constants.CONST_INT;
    }

    public static long constLong() {
        return B1b_Constants.CONST_LONG;
    }

    public static float constFloat() {
        return B1b_Constants.CONST_FLOAT;
    }

    public static double constDouble() {
        return B1b_Constants.CONST_DOUBLE;
    }

    public static char constChar() {
        return B1b_Constants.CONST_CHAR;
    }
}

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NPE通常是工具中的一个bug。但是，我无法在我的机器（Mac 10.10）上复制您的问题。请注意，EvoSuite目前面向Java 7。想知道您是否在这里遇到了Java8的一些副作用（例如RMI的处理）。。。（或其为Ubuntu构建的JVM）

---

您可以尝试运行

-Dnew_statistics=false

，看看是否仍会遇到同样的问题。

我建议与EvoSuite团队联系。来自库内部的NPE通常意味着库中的bug。EvoSuite正在积极开发中，因此您的案例很有可能会得到考虑。是的，工具中的错误是我的建议。不幸的是，我忘记强调“通常”意味着有时生成成功退出，有时使用NPE停止（对于同一个命令）。为了说明这一点，我使用了Oracle JVM。使用-Dnew_statistics=false参数，我没有遇到这个问题，但是，我发现了另一个bug：使用JUNIT3失败，但使用JUNIT4可以工作（命令和输出：）。另一个问题：您是否计划在接下来的几个月内提供Java8支持？