Uncaught exception from servlet java.lang.NoClassDefFoundError: java.nio.channels.spi.SelectorProvider is a restricted class. Please see the Google App Engine developer’s guide for more details.
at com.google.apphosting.runtime.security.shared.stub.java.nio.channels.spi.SelectorProvider.(SelectorProvider.java)
at com.couchbase.client.deps.io.netty.channel.nio.NioEventLoopGroup.(NioEventLoopGroup.java:52)
at com.couchbase.client.core.env.DefaultCoreEnvironment.(DefaultCoreEnvironment.java:262)
at com.couchbase.client.java.env.DefaultCouchbaseEnvironment.(DefaultCouchbaseEnvironment.java:124)
at com.couchbase.client.java.env.DefaultCouchbaseEnvironment.(DefaultCouchbaseEnvironment.java:55)
at com.couchbase.client.java.env.DefaultCouchbaseEnvironment$Builder.build(DefaultCouchbaseEnvironment.java:472)
at com.couchbase.client.java.env.DefaultCouchbaseEnvironment.create(DefaultCouchbaseEnvironment.java:158)
at com.couchbase.client.java.CouchbaseCluster.create(CouchbaseCluster.java:164)
at ben.tests.couch8.backend.MyServlet.doPost(MyServlet.java:40)
Is there a workaround? Shall I try another cloud provider? Suggestions?
Ultimately I was trying to create a new user or log the user in. I followed these two blog posts: blog. couchbase. com/2015/september/adding-user-sign-up-to-your-android-app-with-node.js-and-couchbase-mobile and blog. couchbase. com/traveling-with-couchbase-using-the-java-sdk
If I delete this line: Cluster cluster = CouchbaseCluster.create("MY-IP"); then there is no error and username and password are printed.
I guess that the “MY-IP”-address is correct. I can point my browser to “MY-IP”:4984 and receive a valid output: {"couchdb":"Welcome","vendor":{"name":"Couchbase Sync Gateway","version":1},"version":"Couchbase Sync Gateway/1.1.1(10;2fff9eb)"}
TRACE Logging
I searched for Google App engine and Trace Logging. This seemed to be for performance measurements. I can only provide you the two traces below. Sorry!
This is the full stack trace: Warning:
java.lang.NoClassDefFoundError: Could not initialize class
com.google.apphosting.runtime.security.shared.stub.java.nio.channels.spi.SelectorProvider
at com.couchbase.client.deps.io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:52)
at com.couchbase.client.core.env.DefaultCoreEnvironment.<init>(DefaultCoreEnvironment.java:262)
at com.couchbase.client.java.env.DefaultCouchbaseEnvironment.<init>(DefaultCouchbaseEnvironment.java:124)
at com.couchbase.client.java.env.DefaultCouchbaseEnvironment.<init>(DefaultCouchbaseEnvironment.java:55)
at com.couchbase.client.java.env.DefaultCouchbaseEnvironment$Builder.build(DefaultCouchbaseEnvironment.java:472)
at com.couchbase.client.java.env.DefaultCouchbaseEnvironment.create(DefaultCouchbaseEnvironment.java:158)
at com.couchbase.client.java.CouchbaseCluster.create(CouchbaseCluster.java:164)
at com.couchbase.client.java.CouchbaseCluster.create(CouchbaseCluster.java:151)
at ben.tests.couch8.backend.MyServlet.doPost(MyServlet.java:40)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
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$CachedChain.doFilter(ServletHandler.java:1166)
at com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlobUploadFilter.java:125)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:37)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.apphosting.utils.servlet.JdbcMySqlConnectionCleanupFilter.doFilter(JdbcMySqlConnectionCleanupFilter.java:60)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:260)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
at com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:78)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:148)
at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:469)
at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:437)
at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:444)
at com.google.tracing.CurrentContext.runInContext(CurrentContext.java:256)
at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:308)
at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:300)
at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:441)
at com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:235)
at java.lang.Thread.run(Thread.java:745)
Fatal:
java.lang.NoClassDefFoundError: Could not initialize class com.google.apphosting.runtime.security.shared.stub.java.nio.channels.spi.SelectorProvider
at com.couchbase.client.deps.io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:52)
at com.couchbase.client.core.env.DefaultCoreEnvironment.<init>(DefaultCoreEnvironment.java:262)
at com.couchbase.client.java.env.DefaultCouchbaseEnvironment.<init>(DefaultCouchbaseEnvironment.java:124)
at com.couchbase.client.java.env.DefaultCouchbaseEnvironment.<init>(DefaultCouchbaseEnvironment.java:55)
at com.couchbase.client.java.env.DefaultCouchbaseEnvironment$Builder.build(DefaultCouchbaseEnvironment.java:472)
at com.couchbase.client.java.env.DefaultCouchbaseEnvironment.create(DefaultCouchbaseEnvironment.java:158)
at com.couchbase.client.java.CouchbaseCluster.create(CouchbaseCluster.java:164)
at com.couchbase.client.java.CouchbaseCluster.create(CouchbaseCluster.java:151)
at ben.tests.couch8.backend.MyServlet.doPost(MyServlet.java:40)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
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$CachedChain.doFilter(ServletHandler.java:1166)
at com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlobUploadFilter.java:125)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:37)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.apphosting.utils.servlet.JdbcMySqlConnectionCleanupFilter.doFilter(JdbcMySqlConnectionCleanupFilter.java:60)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:260)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
at com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:78)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:148)
at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:469)
at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:437)
at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:444)
at com.google.tracing.CurrentContext.runInContext(CurrentContext.java:256)
at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:308)
at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:300)
at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:441)
at com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:235)
at java.lang.Thread.run(Thread.java:745)
Interesting. Is there a change we should make? It seems odd that classloading NIO is how a security restriction would fail. Any pointers to authoritative docs?
It says NIO is not available apparently - one thing we could try is using OIO in netty (uses blocking io) but we never tested that. All you need to do is pass in a OioEventLoopGroup into the environment - let me know if that works.
But the person in the post also said we’d have trouble opening threads which if true seems like a blocking issue for using any kind of networking lib on GAE?