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java.nio.file.Files is a restricted class. Please see the Google App Engine developer's guide for more details. at com.google.appengine.runtime.Request.process-2b983165ceac1ba1(Request.java)
java.lang.NoClassDefFoundError: java.nio.file.Files is a restricted class. Please see the Google App Engine developer's guide for more details.
at com.google.appengine.runtime.Request.process-2b983165ceac1ba1(Request.java)	at java.nio.file.Files.(Files.java)	at java.lang.reflect.Method.invoke(Method.java:44)	at com.google.api.client.util.IOUtils.isSymbolicLink(IOUtils.java:203)	at com.google.api.client.util.store.FileDataStoreFactory.(FileDataStoreFactory.java:59)	at com.adwalnut.api.TagManagerUtil.getTagManager(TagManagerUtil.java:40)	at com.adwalnut.api.CreateContainer.doGet(CreateContainer.java:42)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)	at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)	at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)	at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)	at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)	at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)	at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)	at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)	at org.mortbay.jetty.Server.handle(Server.java:326)	at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)	at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)	at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)	at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:446)	at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:453)	at com.google.tracing.CurrentContext.runInContext(CurrentContext.java:276)	at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:312)	at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:304)	at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:450)	at java.lang.Thread.run(Thread.java:745)