icu4j error when building the maven site

[INFO] Rendering site with org.apache.maven.skins:maven-default-skin:jar:1.0 skin.
[INFO] Generating "Project Summary" report    --- maven-project-info-reports-plugin:2.4
[INFO] Generating "About" report    --- maven-project-info-reports-plugin:2.4
[INFO] Generating "Dependencies" report    --- maven-project-info-reports-plugin:2.4
[WARNING] Unable to process class com/ibm/icu/impl/data/LocaleElements_zh__PINYIN.class in JarAnalyzer File /Users/vmassol/.m2/repository/com/ibm/icu/icu4j/2.6.1/icu4j-2.6.1.jar
org.apache.bcel.classfile.ClassFormatException: Invalid byte tag in constant pool: 60
	at org.apache.bcel.classfile.Constant.readConstant(Constant.java:146)
	at org.apache.bcel.classfile.ConstantPool.<init>(ConstantPool.java:67)
	at org.apache.bcel.classfile.ClassParser.readConstantPool(ClassParser.java:222)
	at org.apache.bcel.classfile.ClassParser.parse(ClassParser.java:136)
	at org.apache.maven.shared.jar.classes.JarClassesAnalysis.analyze(JarClassesAnalysis.java:92)
	at org.apache.maven.report.projectinfo.dependencies.Dependencies.getJarDependencyDetails(Dependencies.java:257)
	at org.apache.maven.report.projectinfo.dependencies.renderer.DependenciesRenderer.hasSealed(DependenciesRenderer.java:1378)
	at org.apache.maven.report.projectinfo.dependencies.renderer.DependenciesRenderer.renderSectionDependencyFileDetails(DependenciesRenderer.java:546)
	at org.apache.maven.report.projectinfo.dependencies.renderer.DependenciesRenderer.renderBody(DependenciesRenderer.java:273)
	at org.apache.maven.reporting.AbstractMavenReportRenderer.render(AbstractMavenReportRenderer.java:79)
	at org.apache.maven.report.projectinfo.DependenciesReport.executeReport(DependenciesReport.java:196)
	at org.apache.maven.reporting.AbstractMavenReport.generate(AbstractMavenReport.java:190)
	at org.apache.maven.plugins.site.ReportDocumentRenderer.renderDocument(ReportDocumentRenderer.java:219)
	at org.apache.maven.doxia.siterenderer.DefaultSiteRenderer.renderModule(DefaultSiteRenderer.java:319)
	at org.apache.maven.doxia.siterenderer.DefaultSiteRenderer.render(DefaultSiteRenderer.java:135)
	at org.apache.maven.plugins.site.SiteMojo.renderLocale(SiteMojo.java:175)
	at org.apache.maven.plugins.site.SiteMojo.execute(SiteMojo.java:138)
	at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
	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:320)
	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)
[INFO] Generating "Dependency Convergence" report    --- maven-project-info-reports-plugin:2.4
[INFO] Generating "Mailing Lists" report    --- maven-project-info-reports-plugin:2.4
[INFO] Generating "Issue Tracking" report    --- maven-project-info-reports-plugin:2.4
[INFO] Generating "Source Repository" report    --- maven-project-info-reports-plugin:2.4