Question

我创建了一个Maven项目，当我通过eclipse运行项目的所有单元测试时，所有这些都按预期传递。但是，当我通过终端进行mvn install时，我发现测试testPredictThrowsException()出现以下错误：

testPredictThrowsException(com.ner.core.NamedEntityRecognizerTest)  Time elapsed: 0.001 sec  <<< ERROR!
java.lang.NullPointerException
    at com.ner.core.NamedEntityRecognizer.train(NamedEntityRecognizer.java:70)
    at com.ner.core.NamedEntityRecognizerTest.setUp(NamedEntityRecognizerTest.java:20)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

...这意味着我在ner setUp（）方法中实例化的对象@Before没有被运行，导致它被设置为null。这是测试和POM.xml。想法？

public class NamedEntityRecognizerTest {

    NamedEntityRecognizer ner;

    @Before
    public void setUp() throws NamedEntityRecognizerException {
            ner = new NamedEntityRecognizer();
            InputStream trainingStream = NamedEntityRecognizerTest.class.getClassLoader().getResourceAsStream("trainingData1.train");
            ner.train(trainingStream);
    }

    @Test(expected=NamedEntityRecognizerException.class)
    public void testPredictThrowsException() throws NamedEntityRecognizerException {
            System.out.println("NERRRR: " + ner);
            ner.predict(null);
    }
}

的pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.ner</groupId>
    <artifactId>AmpelloNER</artifactId>
    <packaging>jar</packaging>
    <version>1.0-SNAPSHOT</version>
    <name>AmpelloNER</name>
    <url>http://maven.apache.org</url>

    <dependencies>
        <dependency>
            <groupId>commons-collections</groupId>
            <artifactId>commons-collections</artifactId>
            <version>3.2.1</version>
        </dependency>

        <dependency>
            <!-- more dependencies go here... -->
        </dependency>
</dependencies>
</project>

更新

当我尝试获取test/resources/目录中文件的绝对路径时，我发现NullPointerException被抛出（参见下面的代码）。当我通过eclipse运行测试时，它能够找到该文件，但是，当我尝试通过键入mvn install来通过终端运行它时，它会抛出NullPointerException。我该如何解决这个问题？

@Before
public void setUp() throws NamedEntityRecognizerException {
    ner = new NamedEntityRecognizer();
    String trainingFile = NamedEntityRecognizerTest.class.getClassLoader().getResourceAsStream("trainingData1.train");
    ner.train(trainingFile); // <<<---- This throws the NPE
}

Maven测试从eclipse成功，但从终端

0 个答案: