error in beta4 Mail demo

[mjmsmith]

After successfully building the beta4 Mail sample, I get the following error when I run it:

[ERROR] Unable to instantiate 'com.extjs.gxt.samples.mail.server.MailServiceImpl'
java.lang.ClassNotFoundException: com.extjs.gxt.samples.mail.server.MailServiceImpl

This is on OS X 10.5.3 with java version "1.5.0_13".

[gslender]

how exactly are you launching it? the error is saying it can't find the classes specified so perhaps something is missing in your launch config.

[mjmsmith]

I edited Mail-compile.sh and Mail-shell.sh as follows:

- added "-Xmx512M"
- changed GWT_HOME to point to my GWT dir (1.5RC1)
- changed "gwt-dev-linux.jar" to "gwt-dev-mac.jar" in the classpath

I also added "-XstartOnFirstThread" to Mail-shell.sh.

I built/launched it by running the shell script from the samples/mail dir.

The sample loads ok initially. I don't get the error until after the login dialog goes away and the "EXT GWT Mail Demo" interface is displayed.

[gslender]

ok - so did you javac compile the mail have source into a directory called bin?

the shell script is only looking in these locations for the java compile classes... do any of these match?

src:
.:
../bin:

[posta07]

I too am getting the error mjmsmith is getting.
I am on windows with GWT 1.5 RC1 and GXT beta 4.

Please help me understand why I am getting this error.

Thanks!


[ERROR] Unable to instantiate 'com.extjs.gxt.samples.mail.server.MailServiceImpl'
java.lang.ClassNotFoundException: com.extjs.gxt.samples.mail.server.MailServiceImpl
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
at java.lang.Class.forName(Class.java:169)
at com.google.gwt.dev.shell.GWTShellServlet.tryGetOrLoadServlet(GWTShellServlet.java:952)
at com.google.gwt.dev.shell.GWTShellServlet.service(GWTShellServlet.java:278)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

[mjmsmith]

ok - so did you javac compile the mail have source into a directory called bin?

I'm sorry, I don't understand the question.

I've done a successful build with Mail-compile.sh. The server-side MailServerImpl.java file doesn't get compiled into a class file anywhere. The class file is present in the pre-existing mail.war, but perhaps I'm unclear on how to run the server. What would be the normal process for getting the mail sample up and running?

[gslender]

there are two parts to a GWT hosted application (if you are using RPC)

1) the client side which is compiled from java source

2) the server side which is a native java application that needs to be compiled and launched by the tomcat web server - servlet container

you are doing 1 but not 2

war files contain both 1 and 2 but are used by 2 to publish 1 and launch 2

gwt compiler just does 1

javac can compile 2 for use by gwt hosted mode (which contains tomcat for 2 and a browser for 1)

[gsmd]

same here.
unpacked, changed the paths in Mail-shell.cmd, run it. get exactly the same

[ERROR] Unable to instantiate 'com.extjs.gxt.samples.mail.server.MailServiceImpl'

winxp, ext 1.1, gwt 1.5.2.

[mgallinucci]

I have the same problem: I changed GWT_HOME to my gwt install dir, and I get the same problem...

[ERROR] Unable to instantiate 'com.extjs.gxt.samples.mail.server.MailServiceImpl'

It seems that it doesn't compile src from resources project (MailServiceImpl has imports from that project). The Mail-shell.cmd include also resources/src folder, so it should compile also that classes.

I really don't understand how to work the example!

[posta07]

You need to compile the server side classes yourself (using javac for example). The GWT compile (or hosted mode) script DOES NOT compile the server-side classes for you.

See grant's post:

there are two parts to a GWT hosted application (if you are using RPC)

1) the client side which is compiled from java source

2) the server side which is a native java application that needs to be compiled and launched by the tomcat web server - servlet container

you are doing 1 but not 2

war files contain both 1 and 2 but are used by 2 to publish 1 and launch 2

gwt compiler just does 1

javac can compile 2 for use by gwt hosted mode (which contains tomcat for 2 and a browser for 1)