Juan José Ramos Cassella created GEODE-4794:
-----------------------------------------------

             Summary: ConfigurePDXCommand Fails When Using Defaults
                 Key: GEODE-4794
                 URL: https://issues.apache.org/jira/browse/GEODE-4794
             Project: Geode
          Issue Type: Bug
          Components: docs, gfsh
            Reporter: Juan José Ramos Cassella


While working on a fix for  GEODE-4771 I've came across another bug: the 
{{configure pdx}} command fails when no parameters are specified, even when we 
state in the [User 
Guide|http://geode.apache.org/docs/guide/14/tools_modules/gfsh/command-pages/configure.html]
 that no parameters are mandatory.

The source code doesn't enforce any of the parameters and, as such, the 
resulting {{XmlEntity}} ends up being empty, so a {{NullPointerException}} is 
thrown when the command tries to persist the changes to the cluster 
configuration service:
{code:java}
[error 2018/03/07 11:07:48.242 GMT locator1 <RMI TCP Connection(2)-127.0.0.1> 
tid=0x55] error updating cluster configuration for group cluster
java.lang.NullPointerException
        at java.io.StringReader.<init>(StringReader.java:50)
        at 
org.apache.geode.management.internal.configuration.utils.XmlUtils.createNode(XmlUtils.java:242)
        at 
org.apache.geode.management.internal.configuration.utils.XmlUtils.addNewNode(XmlUtils.java:133)
        at 
org.apache.geode.distributed.internal.ClusterConfigurationService.addXmlEntity(ClusterConfigurationService.java:204)
        at 
org.apache.geode.management.internal.cli.commands.ConfigurePDXCommand.lambda$configurePDX$0(ConfigurePDXCommand.java:131)
        at 
org.apache.geode.management.internal.cli.commands.GfshCommand.persistClusterConfiguration(GfshCommand.java:72)
        at 
org.apache.geode.management.internal.cli.commands.ConfigurePDXCommand.configurePDX(ConfigurePDXCommand.java:130)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
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.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:216)
        at 
org.apache.geode.management.internal.cli.remote.CommandExecutor.invokeCommand(CommandExecutor.java:97)
        at 
org.apache.geode.management.internal.cli.remote.CommandExecutor.execute(CommandExecutor.java:45)
        at 
org.apache.geode.management.internal.cli.remote.CommandExecutor.execute(CommandExecutor.java:39)
        at 
org.apache.geode.management.internal.cli.remote.OnlineCommandProcessor.executeCommand(OnlineCommandProcessor.java:133)
        at 
org.apache.geode.management.internal.beans.MemberMBeanBridge.processCommand(MemberMBeanBridge.java:1579)
        at 
org.apache.geode.management.internal.beans.MemberMBean.processCommand(MemberMBean.java:412)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
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 sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
        at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
        at 
com.sun.jmx.mbeanserver.ConvertingMethod.invokeWithOpenReturn(ConvertingMethod.java:193)
        at 
com.sun.jmx.mbeanserver.ConvertingMethod.invokeWithOpenReturn(ConvertingMethod.java:175)
        at 
com.sun.jmx.mbeanserver.MXBeanIntrospector.invokeM2(MXBeanIntrospector.java:117)
        at 
com.sun.jmx.mbeanserver.MXBeanIntrospector.invokeM2(MXBeanIntrospector.java:54)
        at 
com.sun.jmx.mbeanserver.MBeanIntrospector.invokeM(MBeanIntrospector.java:237)
        at com.sun.jmx.mbeanserver.PerInterface.invoke(PerInterface.java:138)
        at com.sun.jmx.mbeanserver.MBeanSupport.invoke(MBeanSupport.java:252)
        at 
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
        at 
com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
        at 
javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1468)
        at 
javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:76)
        at 
javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1309)
        at 
javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1401)
        at 
javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:829)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
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 sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:357)
        at sun.rmi.transport.Transport$1.run(Transport.java:200)
        at sun.rmi.transport.Transport$1.run(Transport.java:197)
        at java.security.AccessController.doPrivileged(Native Method)
        at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
        at 
sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:568)
        at 
sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:826)
        at 
sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:683)
        at java.security.AccessController.doPrivileged(Native Method)
        at 
sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
{code}
 

That said, currently the \{{configure pdx}} command only allows the user to use 
the \{{ReflectionBasedAutoSerializer}} class, which requires a decision on 
whether the \{{check-portability}} flag is set as \{{true}} or \{{false}}. 
This, in turn, enforces the usage of either 
\{{portable-auto-serializable-classes}} or \{{auto-serializable-classes}}, so 
these flags should be set as mandatory, mutually exclusive, within the command.



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