Git connector Test throws java.io.IOException: Unable to delete file

Reproduce steps:
create new git connector and test it

Problem:
see server log: java.io.IOException: Unable to delete file
The exception has no impact on the functionality. Everything is working fine!

Expected behavior:
No exception

Hints (optional):
16-Dec-2014 13:13:32 org.slf4j.impl.JCLLoggerAdapter error
SEVERE: Unable to delete 'baseTemporaryFileStore'
java.io.IOException: Unable to delete file: C:\dev\camunda-bpm-platform\camunda-cycle-distro-3.1.0-20141215.170406-8\server\apache-tomcat-7.0.50\temp\CAMUNDA_GIT_CON_TEMP_87c63c2a-11a4-43df-b49d-01755151a2ed\.git\objects\pack\pack-79b1876917da89f530ed0a2f11989188c
at org.apache.commons.io.FileUtils.forceDelete(FileUtils.java:1919)
at org.apache.commons.io.FileUtils.cleanDirectory(FileUtils.java:1399)
at org.apache.commons.io.FileUtils.deleteDirectory(FileUtils.java:1331)
at org.apache.commons.io.FileUtils.forceDelete(FileUtils.java:1910)
at org.apache.commons.io.FileUtils.cleanDirectory(FileUtils.java:1399)
at org.apache.commons.io.FileUtils.deleteDirectory(FileUtils.java:1331)
at org.apache.commons.io.FileUtils.forceDelete(FileUtils.java:1910)
at org.apache.commons.io.FileUtils.cleanDirectory(FileUtils.java:1399)
at org.apache.commons.io.FileUtils.deleteDirectory(FileUtils.java:1331)
at org.apache.commons.io.FileUtils.forceDelete(FileUtils.java:1910)
at org.apache.commons.io.FileUtils.cleanDirectory(FileUtils.java:1399)
at org.apache.commons.io.FileUtils.deleteDirectory(FileUtils.java:1331)
at org.camunda.bpm.cycle.connector.git.GitConnector.disposeRepository(GitConnector.java:403)
at org.camunda.bpm.cycle.connector.git.GitConnector.dispose(GitConnector.java:389)
at org.camunda.bpm.cycle.connector.git.GitConnector$$FastClassByCGLIB$$d48bb702.invoke(<generated>)
at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
at org.springframework.aop.framework.Cglib2AopProxy$CglibMethodInvocation.invokeJoinpoint(Cglib2AopProxy.java:689)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:90)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:90)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:622)
at org.camunda.bpm.cycle.connector.git.GitConnector$$EnhancerByCGLIB$$b157654a.dispose(<generated>)
at org.camunda.bpm.cycle.connector.ConnectorRegistry.testConnectorConfiguration(ConnectorRegistry.java:217)
at org.camunda.bpm.cycle.web.service.resource.ConnectorConfigurationService.test(ConnectorConfigurationService.java:93)
at org.camunda.bpm.cycle.web.service.resource.ConnectorConfigurationService$$FastClassByCGLIB$$7cb88e29.invoke(<generated>)
at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:618)
at org.camunda.bpm.cycle.web.service.resource.ConnectorConfigurationService$$EnhancerByCGLIB$$a3fee85d.test(<generated>)
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 com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60)
at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$TypeOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:185)
at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75)
at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:302)
at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108)
at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84)
at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1480)
at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1411)
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1360)
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1350)
at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:416)
at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:538)
at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:716)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.camunda.bpm.cycle.web.filter.IdentityHolderFilter.doFilter(IdentityHolderFilter.java:35)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.camunda.bpm.security.web.SecurityFilter.doFilterSecure(SecurityFilter.java:98)
at org.camunda.bpm.security.web.SecurityFilter.doFilter(SecurityFilter.java:58)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:409)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1044)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:313)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
at java.lang.Thread.run(Thread.java:662)