Getting exception while creating router using routerApi

This issue is not occurring everywhere our app is running.
The stack trace :
java.lang.IllegalArgumentException: Error parsing data at 21
at org.jclouds.date.internal.SimpleDateFormatDateService.iso8601SecondsDateParse(SimpleDateFormatDateService.java:166)
at org.jclouds.json.config.GsonModule$Iso8601DateAdapter.parseDate(GsonModule.java:241)
at org.jclouds.json.config.GsonModule$Iso8601DateAdapter.read(GsonModule.java:234)
at org.jclouds.json.config.GsonModule$Iso8601DateAdapter.read(GsonModule.java:220)
at com.google.gson.TypeAdapter$1.read(TypeAdapter.java:199)
at org.jclouds.json.internal.DeserializationConstructorAndReflectiveTypeAdapterFactory$ParameterReader.read(DeserializationConstructorAndReflectiveTypeAdapterFactory.java:272)
at org.jclouds.json.internal.DeserializationConstructorAndReflectiveTypeAdapterFactory$DeserializeIntoParameterizedConstructor.read(DeserializationConstructorAndReflectiveTypeAdapterFactory.java:184)
at org.jclouds.json.internal.NullFilteringTypeAdapterFactories$IterableTypeAdapter.readAndBuild(NullFilteringTypeAdapterFactories.java:95)
at org.jclouds.json.internal.NullFilteringTypeAdapterFactories$SetTypeAdapter.read(NullFilteringTypeAdapterFactories.java:185)
at org.jclouds.json.internal.NullFilteringTypeAdapterFactories$SetTypeAdapter.read(NullFilteringTypeAdapterFactories.java:171)
at com.google.gson.Gson.fromJson(Gson.java:879)
at org.jclouds.http.functions.ParseFirstJsonValueNamed.apply(ParseFirstJsonValueNamed.java:80)
at org.jclouds.http.functions.ParseFirstJsonValueNamed.apply(ParseFirstJsonValueNamed.java:44)
at org.jclouds.rest.internal.InvokeHttpMethod.invoke(InvokeHttpMethod.java:90)
at org.jclouds.rest.internal.InvokeHttpMethod.apply(InvokeHttpMethod.java:73)
at org.jclouds.rest.internal.InvokeHttpMethod.apply(InvokeHttpMethod.java:44)
at org.jclouds.reflect.FunctionalReflection$FunctionalInvocationHandler.handleInvocation(FunctionalReflection.java:117)
at com.google.common.reflect.AbstractInvocationHandler.invoke(AbstractInvocationHandler.java:87)
at com.sun.proxy.$Proxy1189.list(Unknown Source)
at org.jclouds.openstack.neutron.v2.config.NeutronHttpApiModule$1.load(NeutronHttpApiModule.java:81)
at org.jclouds.openstack.neutron.v2.config.NeutronHttpApiModule$1.load(NeutronHttpApiModule.java:78)
at com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3524)
at com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2317)
at com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2280)
at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2195)
at com.google.common.cache.LocalCache.get(LocalCache.java:3934)
at com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:3938)
at com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4821)
at com.google.common.cache.LocalCache$LocalLoadingCache.getUnchecked(LocalCache.java:4827)
at org.jclouds.openstack.v2_0.functions.PresentWhenExtensionAnnotationMatchesExtensionSet.checkExtension(PresentWhenExtensionAnnotationMatchesExtensionSet.java:71)
at org.jclouds.openstack.v2_0.functions.PresentWhenExtensionAnnotationMatchesExtensionSet.apply(PresentWhenExtensionAnnotationMatchesExtensionSet.java:104)
at org.jclouds.openstack.v2_0.functions.PresentWhenExtensionAnnotationMatchesExtensionSet.apply(PresentWhenExtensionAnnotationMatchesExtensionSet.java:57)
at org.jclouds.rest.internal.DelegatesToInvocationFunction.propagateContextToDelegate(DelegatesToInvocationFunction.java:205)
at org.jclouds.rest.internal.DelegatesToInvocationFunction.handle(DelegatesToInvocationFunction.java:154)
at org.jclouds.rest.internal.DelegatesToInvocationFunction.invoke(DelegatesToInvocationFunction.java:123)
at com.sun.proxy.$Proxy1183.getRouterApi(Unknown Source)
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sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:776)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:705)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:868)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:522)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1095)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:672)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1502)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1458)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.text.ParseException: Unparseable date: "2015-06-17T12:15:12-3000"
at java.text.DateFormat.parse(DateFormat.java:366)
at org.jclouds.date.internal.SimpleDateFormatDateService.iso8601SecondsDateParse(SimpleDateFormatDateService.java:164)