我尝试遵循spring网站上的示例来使用SOAP Web服务（https://spring.io/guides/gs/consuming-web-service/）：
该应用程序正常运行，可以正确使用服务，但是pom.xml文件上存在错误。 pom产生错误的部分是：
<plugin>
<groupId>org.jvnet.jaxb2.maven2</groupId>
<artifactId>maven-jaxb2-plugin</artifactId>
<version>0.14.0</version>
<executions>
<execution>
<goals>
<goal>generate</goal>
</goals>
</execution>
</executions>
<configuration>
<schemaLanguage>WSDL</schemaLanguage>
<generatePackage>home.wsdl</generatePackage>
<schemas>
<schema>
<url>http://localhost:8080/ws/countries.wsdl</url>
</schema>
</schemas>
</configuration>
</plugin>
错误在目标代码上：
Execution default of goal org.jvnet.jaxb2.maven2:maven-jaxb2-plugin:0.14.0:generate failed. (org.jvnet.jaxb2.maven2:maven-jaxb2-plugin:0.14.0:generate:default:generate-sources)
org.apache.maven.plugin.PluginExecutionException: Execution default of goal org.jvnet.jaxb2.maven2:maven-jaxb2-plugin:0.14.0:generate failed.
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:145)
at org.eclipse.m2e.core.internal.embedder.MavenImpl.execute(MavenImpl.java:331)
at org.eclipse.m2e.core.internal.embedder.MavenImpl$11.call(MavenImpl.java:1362)
at org.eclipse.m2e.core.internal.embedder.MavenImpl$11.call(MavenImpl.java:1)
at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.executeBare(MavenExecutionContext.java:177)
at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:112)
at org.eclipse.m2e.core.internal.embedder.MavenImpl.execute(MavenImpl.java:1360)
at org.eclipse.m2e.core.project.configurator.MojoExecutionBuildParticipant.build(MojoExecutionBuildParticipant.java:52)
at org.eclipse.m2e.core.internal.builder.MavenBuilderImpl.build(MavenBuilderImpl.java:137)
at org.eclipse.m2e.core.internal.builder.MavenBuilder$1.method(MavenBuilder.java:172)
at org.eclipse.m2e.core.internal.builder.MavenBuilder$1.method(MavenBuilder.java:1)
at org.eclipse.m2e.core.internal.builder.MavenBuilder$BuildMethod$1$1.call(MavenBuilder.java:115)
at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.executeBare(MavenExecutionContext.java:177)
at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:112)
at org.eclipse.m2e.core.internal.builder.MavenBuilder$BuildMethod$1.call(MavenBuilder.java:105)
at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.executeBare(MavenExecutionContext.java:177)
at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:151)
at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:99)
at org.eclipse.m2e.core.internal.builder.MavenBuilder$BuildMethod.execute(MavenBuilder.java:86)
at org.eclipse.m2e.core.internal.builder.MavenBuilder.build(MavenBuilder.java:200)
at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:735)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:206)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:246)
at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:301)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:304)
at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:360)
at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:383)
at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:142)
at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:232)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:56)
Caused by: java.lang.NullPointerException
at com.sun.tools.xjc.ModelLoader.loadWSDL(ModelLoader.java:390)
at com.sun.tools.xjc.ModelLoader.load(ModelLoader.java:158)
at com.sun.tools.xjc.ModelLoader.load(ModelLoader.java:117)
at org.jvnet.mjiip.v_2_3.XJC23Mojo.loadModel(XJC23Mojo.java:50)
at org.jvnet.mjiip.v_2_3.XJC23Mojo.doExecute(XJC23Mojo.java:40)
at org.jvnet.mjiip.v_2_3.XJC23Mojo.doExecute(XJC23Mojo.java:28)
at org.jvnet.jaxb2.maven2.RawXJC2Mojo.doExecute(RawXJC2Mojo.java:478)
at org.jvnet.jaxb2.maven2.RawXJC2Mojo.execute(RawXJC2Mojo.java:320)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
... 31 more
pom.xml /FrankSOAPClient line 45 Maven Build Problem