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java.lang.NullPointerException: 	at com.ibm.net.ssl.www.protocol.http.h.close(Unknown Source)	at java.io.FilterInputStream.close(FilterInputStream.java:179)	at com.ibm.net.ssl.www.protocol.http.f.close(Unknown Source)	at org.codehaus.plexus.util.IOUtil.close(IOUtil.java:740)	at org.apache.maven.wagon.AbstractWagon.getTransfer(AbstractWagon.java:224)	at org.apache.maven.wagon.AbstractWagon.getTransfer(AbstractWagon.java:182)	at org.apache.maven.wagon.StreamWagon.get(StreamWagon.java:80)	at org.apache.maven.artifact.manager.DefaultWagonManager.verifyChecksum(DefaultWagonManager.java:520)	at org.apache.maven.artifact.manager.DefaultWagonManager.getRemoteFile(DefaultWagonManager.java:380)	at org.apache.maven.artifact.manager.DefaultWagonManager.getArtifactMetadata(DefaultWagonManager.java:295)	at org.apache.maven.artifact.repository.metadata.DefaultRepositoryMetadataManager.resolveAlways(DefaultRepositoryMetadataManager.java:356)	at org.apache.maven.artifact.repository.metadata.DefaultRepositoryMetadataManager.resolve(DefaultRepositoryMetadataManager.java:91)	at org.apache.maven.artifact.transform.AbstractVersionTransformation.resolveVersion(AbstractVersionTransformation.java:62)	at org.apache.maven.artifact.transform.LatestArtifactTransformation.transformForResolve(LatestArtifactTransformation.java:38)	at org.apache.maven.artifact.transform.DefaultArtifactTransformationManager.transformForResolve(DefaultArtifactTransformationManager.java:40)	at org.apache.maven.artifact.resolver.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:104)	at org.apache.maven.artifact.resolver.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:63)	at org.apache.maven.project.DefaultMavenProjectBuilder.findModelFromRepository(DefaultMavenProjectBuilder.java:467)	at org.apache.maven.project.DefaultMavenProjectBuilder.buildFromRepository(DefaultMavenProjectBuilder.java:225)	at org.apache.maven.project.artifact.MavenMetadataSource.retrieve(MavenMetadataSource.java:102)	at org.apache.maven.plugin.version.DefaultPluginVersionManager.resolveMetaVersion(DefaultPluginVersionManager.java:669)	at org.apache.maven.plugin.version.DefaultPluginVersionManager.resolvePluginVersion(DefaultPluginVersionManager.java:183)	at org.apache.maven.plugin.version.DefaultPluginVersionManager.resolvePluginVersion(DefaultPluginVersionManager.java:87)	at org.apache.maven.plugin.DefaultPluginManager.verifyPlugin(DefaultPluginManager.java:158)	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.verifyPlugin(DefaultLifecycleExecutor.java:1252)	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.getMojoDescriptor(DefaultLifecycleExecutor.java:1517)	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.bindLifecycleForPackaging(DefaultLifecycleExecutor.java:1011)	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.constructLifecycleMappings(DefaultLifecycleExecutor.java:975)	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:453)	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:306)	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:273)	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:140)	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:322)	at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:115)	at org.apache.maven.cli.MavenCli.main(MavenCli.java:256)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:85)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:58)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:60)	at java.lang.reflect.Method.invoke(Method.java:391)	at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)	at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)	at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)	at org.codehaus.classworlds.Launcher.main(Launcher.java:375)