StringIndexOutOfBoundsException in JavaUtils#getPackageName()

Deploying a class with no package causes String index out of range: -1 because of:

String fullName = clazz.getName();
return fullName.substring(0, fullName.lastIndexOf("."));

BTW, why do we have a project-specific JavaUtils... these functionalities must have been coded milion times and with such cases handled.

http://commons.apache.org/lang/api-release/org/apache/commons/lang/ClassUtils.html#getPackageName%28java.lang.Class%29

---------------------------------------------------------------------------
Caused by: java.lang.StringIndexOutOfBoundsException: String index out of range: -1
at java.lang.String.substring(String.java:1937)
at org.jboss.wsf.common.JavaUtils.getPackageName(JavaUtils.java:533)
at org.jboss.ws.metadata.wsdl.WSDLUtils.getTypeNamespace(WSDLUtils.java:700)
at org.jboss.ws.metadata.builder.jaxws.JAXWSWebServiceMetaDataBuilder.processWebService(JAXWSWebServiceMetaDataBuilder.java:306)
at org.jboss.ws.metadata.builder.jaxws.JAXWSWebServiceMetaDataBuilder.buildWebServiceMetaData(JAXWSWebServiceMetaDataBuilder.java:104)
at org.jboss.ws.metadata.builder.jaxws.JAXWSServerMetaDataBuilder.setupProviderOrWebService(JAXWSServerMetaDataBuilder.java:50)
at org.jboss.ws.metadata.builder.jaxws.JAXWSMetaDataBuilderJSE.buildMetaData(JAXWSMetaDataBuilderJSE.java:61)
at org.jboss.wsf.stack.jbws.UnifiedMetaDataDeploymentAspect.start(UnifiedMetaDataDeploymentAspect.java:64)
at org.jboss.wsf.framework.deployment.DeploymentAspectManagerImpl.deploy(DeploymentAspectManagerImpl.java:129)
at org.jboss.wsf.container.jboss50.deployer.ArchiveDeployerHook.deploy(ArchiveDeployerHook.java:76)
at org.jboss.wsf.container.jboss50.deployer.AbstractWebServiceDeployer.internalDeploy(AbstractWebServiceDeployer.java:60)
at org.jboss.deployers.spi.deployer.helpers.AbstractRealDeployer.deploy(AbstractRealDeployer.java:50)
at org.jboss.deployers.plugins.deployers.DeployerWrapper.deploy(DeployerWrapper.java:171)
... 24 more