JSONException

[m4chu]

Hi,

When I receive a message on the client sometimes I have a JSON Exception.

JSONUtilCli.decodePayload=[{"ToSubject":"SpirareReciver","Etichetta":"A02","Lato":"DESTRO","Movimento":false]
com.google.gwt.json.client.JSONException: Error parsing JSON: SyntaxError: missing } after property list
at com.google.gwt.json.client.JSONParser.throwJSONException(JSONParser.java:91)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:157)
at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:326)
at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:207)
at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:126)
at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:561)
at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:269)
at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:91)
at com.google.gwt.json.client.JSONParser.evaluate(JSONParser.java)
at com.google.gwt.json.client.JSONParser.parse(JSONParser.java:218)
at com.google.gwt.json.client.JSONParser.parseLenient(JSONParser.java:70)
at com.google.gwt.json.client.JSONParser.parse(JSONParser.java:54)
at org.jboss.errai.bus.client.json.JSONUtilCli.decodePayload(JSONUtilCli.java:49)
at org.jboss.errai.bus.client.framework.ClientMessageBusImpl.procIncomingPayload(ClientMessageBusImpl.java:1115)
at org.jboss.errai.bus.client.framework.ClientMessageBusImpl.access$7(ClientMessageBusImpl.java:1113)
at org.jboss.errai.bus.client.framework.ClientMessageBusImpl$LongPollRequestCallback.onResponseReceived(ClientMessageBusImpl.java:877)
at com.google.gwt.http.client.Request.fireOnResponseReceived(Request.java:287)
at com.google.gwt.http.client.RequestBuilder$1.onReadyStateChange(RequestBuilder.java:395)
at sun.reflect.GeneratedMethodAccessor40.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:157)
at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:326)
at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:207)
at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:126)
at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:561)
at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:269)
at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:91)
at com.google.gwt.core.client.impl.Impl.apply(Impl.java)
at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:214)
at sun.reflect.GeneratedMethodAccessor25.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:157)
at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:281)
at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:531)
at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:352)
at java.lang.Thread.run(Thread.java:636)

Any way to avoid that?

[cbrock]

What version is this?

[m4chu]

Hi Christopher,

For versions of this below I put the piece of pom.xml file. I followed the guide http://community.jboss.org/wiki/WorkingwithGWTCDIandErrai  to setting up the project.

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <errai.version>1.2.2.Final</errai.version>
        <errai-jms.version>1.1-SNAPSHOT</errai-jms.version>
        <gwt.version>2.1.1</gwt.version>
        <hsqldb.version>1.8.0.7</hsqldb.version>
        <weld.version>1.1.0.Final</weld.version>
        <gwt.maven>2.1.0</gwt.maven>
        <mvel.version>2.0.18-RC4</mvel.version>
        <jetty.version>6.1.25</jetty.version>
        <slf4j.version>1.5.11</slf4j.version>
        <uel.impl.version>2.1.2-b04</uel.impl.version>
        <webDescriptor>jetty</webDescriptor>
    </properties>

[cbrock]

The only way I can think of this can happen is if the message is uncommitted before it transmits.

Is there a consistently re-producable set of code you can submit to us so we can test it?

[m4chu]

the application is very large and many messages are sent. I have this error many times when brodcast messages are sent from the server .

There may be problems if the messages are sent in parallel?

I can show you some pieces of code.

Server(This is a event):

@Override
public void inizioMovimentoNastro(NastroEvent e) {
MessageBuilder.createMessage().toSubject("NatroReciver").signalling()
.with("Lato", e.getLato().name()).with("Movimento", true)
.done().sendNowWith(bus);

}

Client:

bus.subscribe("NatroReciver", new MessageCallback() {

@Override
public void callback(Message message) {
String lato = message.get(String.class, "Lato");
boolean movimento = message.get(Boolean.class, "Movimento");
if (lato.equals(getLato()))
if (movimento){
lNastro.setBackgroundColor("#1C7FE3");
}
else{
lNastro.setBackgroundColor("#000000");
}

}
}); 13/04/2011 11:27:32

[m4chu]

I also tried this but still got the same error:

Server:

@Override
    public void inizioMovimentoNastro(NastroEvent e) {
        MessageBuilder.createMessage().toSubject("NatroReciver")
                .with("Lato", e.getLato().name()).with("Movimento", true)
                .noErrorHandling().sendGlobalWith(bus);

    }

Client:

bus.subscribe("NatroReciver", new MessageCallback() {

            @Override
            public void callback(Message message) {
                String lato = message.get(String.class, "Lato");
                boolean movimento = message.get(Boolean.class, "Movimento");
                if (lato.equals(getLato()))
                    if (movimento){
                        lNastro.setBackgroundColor("#1C7FE3");
                    }
                    else{
                        lNastro.setBackgroundColor("#000000");
                    }

            }
        });

[m4chu]

When there are two or more clients connected I get this error in one of them.

[cbrock]

Can you try with Errai 1.2.3-SNAPSHOT and tell me if you still experience the problem?

[m4chu]

With version 1.2.3-SNAPSHOT the application works. Thank you so much Christopher.