鉴于我有以下自定义魔力...
/**
* @goal portal-test
*/
public class PortalTestMojo extends AbstractMojo {
/*
* @parameter
* @required
*/
private String baseUrl;
public void execute() throws MojoExecutionException {
getLog().info("" + baseUrl.isEmpty());
}
}
。当我在以下pom上使用mvn测试运行时...
25 <build>
26 <plugins>
27 <plugin>
28 <groupId>com.lgi.plugins</groupId>
29 <artifactId>maven-plugin-facade</artifactId>
30 <version>1.0-SNAPSHOT</version>
31 <executions>
32 <execution>
33 <id>testing-mojo</id>
34 <phase>test</phase>
35 <goals>
36 <goal>portal-test</goal>
37 </goals>
38 </execution>
39 </executions>
40 <configuration>
41 <baseUrl>TEST</baseUrl>
42
45 </configuration>
46 </plugin>
47 </plugins>
48 </build>
。我在 baseUrl 上收到空指针异常
[ERROR] Failed to execute goal com.lgi.day:maven-plugin-facade:1.0-SNAPSHOT:portal-test (testing-mojo) on project testPom: Execution testing-mojo of goal com.lgi.day:maven-plugin-facade:1.0-SNAPSHOT:portal-test failed. NullPointerException -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal com.lgi.day:maven-plugin-facade:1.0-SNAPSHOT:portal-test (testing-mojo) on project testPom: Execution testing-mojo of goal com.lgi.day:maven-plugin-facade:1.0-SNAPSHOT:portal-test failed.
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:225)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:319)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
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.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)
Caused by: org.apache.maven.plugin.PluginExecutionException: Execution testing-mojo of goal com.lgi.day:maven-plugin-facade:1.0-SNAPSHOT:portal-test failed.
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:110)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
... 19 more
Caused by: java.lang.NullPointerException
at com.lgi.day.PortalTestMojo.execute(PortalTestMojo.java:52)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
谁能告诉我为什么我的 maven 配置参数在执行之前没有初始化（当它们在 pom 中明确定义时）??????
上面的 pom 文件用于通过的插件的集成测试。这是代码：
import java.io.File;
import org.apache.maven.plugin.testing.AbstractMojoTestCase;
import com.lgi.day.PortalTestMojo;
public class MojoVaribaleAssignmentTest extends AbstractMojoTestCase {
private final String TEST = "TEST";
public void testMojoGoal() throws Exception {
File testPom = new File(getBasedir(), "src/test/resources/testPom.xml");
PortalTestMojo mojo = (PortalTestMojo) lookupMojo("portal-test",
testPom);
assertEquals(TEST, mojo.getBaseUrl());
assertEquals(TEST, mojo.getPortalPath());
assertEquals(TEST, mojo.getUserName());
assertEquals(TEST, mojo.getPassword());
}
}
这是插件本身的pom文件：
<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.lgi.day</groupId>
<artifactId>maven-plugin-facade</artifactId>
<packaging>maven-plugin</packaging>
<version>1.0-SNAPSHOT</version>
<name>maven-plugin-facade Maven Mojo</name>
<url>http://maven.apache.org</url>
<dependencies>
<dependency>
<groupId>org.apache.maven</groupId>
<artifactId>maven-plugin-api</artifactId>
<version>2.0</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.lgi.day</groupId>
<artifactId>groovy-portal-tests-core</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>org.apache.maven.shared</groupId>
<artifactId>maven-plugin-testing-harness</artifactId>
<version>1.0-beta-1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.maven.plugin-tools</groupId>
<artifactId>maven-plugin-tools</artifactId>
<version>RELEASE</version>
</dependency>
</dependencies>
</project>
我正在使用 maven 版本 3.0.3
问题解决了!!
我输入了 mvn 帮助：有效的 pom，并注意到 maven-plugin-plugin 版本是 2.7
然后我查看了生成的插件描述符@target/classes/META-INF/maven/plugin.xml并注意到参数元素为空（）
换句话说，版本 2.7 的 maven-plugin-plugin 描述符目标不会解释注释中显示的旧版注释。
我升级了我的pom以使用最新版本的maven-plugin-plugin，并添加了maven-plugin-annotations作为依赖项。此处概述了必要的更改：
http://maven.apache.org/plugin-tools/maven-plugin-plugin/examples/using-annotations.html
然后我注释了魔术...
@Mojo(name = "portal-test")
public class PortalTestMojo extends AbstractMojo {
@Parameter(required = true)
private String baseUrl;
。等
然后将参数元素填充到插件描述符中