Java – GWT code server uses Maven prototype and does not find modules in the newly generated project
I have been working with GWT and eclipse for some time. I want to play with Maven and GWT plugin (GWT Maven plugin, enter link description here) I tried to use it in eclipse (Luna 4.4), but obviously I didn't do it correctly because it was so fragile that when I changed some small things, the IDE would overwrite its settings, and it would destroy POM regularly xml. So I decided to step back, eliminate the dark magic of eclipse, and start a new project from the command line
However, I can't seem to grasp the problem of running the actual application, because when I execute the code server and navigate to the page, I see the following message:
Can't find any GWT Modules on this page.
Obviously, the code server is running, but the module file does not appear to be hosted AFAIK I saw after several hours of self-study (and found http://blog.ltgt.net/how-does-gwts-super-dev-mode-work/ ）After that, there should be a second process that actually hosts code in parallel with the code server What is the appropriate way to do this with Maven? Should I open the second terminal and run the dock or something in parallel with the code server? If so, can someone give me a hint on how to do this most effectively?
Thank you in advance!
Here's how I create a project:
mvn archetype:generate \ -DarchetypeGroupId=org.codehaus.mojo \ -DarchetypeArtifactId=gwt-maven-plugin \ -DarchetypeVersion=2.7.0 [INFO] Scanning for projects... [INFO] [INFO] ------------------------------------------------------------------------ [INFO] Building Maven Stub Project (No POM) 1 [INFO] ------------------------------------------------------------------------ [INFO] [INFO] >>> maven-archetype-plugin:2.2:generate (default-cli) > generate-sources @ standalone-pom >>> [INFO] [INFO] <<< maven-archetype-plugin:2.2:generate (default-cli) < generate-sources @ standalone-pom <<< [INFO] [INFO] --- maven-archetype-plugin:2.2:generate (default-cli) @ standalone-pom --- [INFO] Generating project in Interactive mode [INFO] Archetype repository missing. Using the one from [org.codehaus.mojo:gwt-maven-plugin:2.7.0] found in catalog remote Define value for property 'groupId': : com.mytest Define value for property 'artifactId': : gwtmvntest Define value for property 'version': 1.0-SNAPSHOT: : Define value for property 'package': com.mytest: : com.mytest.gwtmvntest Define value for property 'module': : GwtMvnTest Confirm properties configuration: groupId: com.mytest artifactId: gwtmvntest version: 1.0-SNAPSHOT package: com.mytest.gwtmvntest module: GwtMvnTest Y: : [INFO] ---------------------------------------------------------------------------- [INFO] Using following parameters for creating project from Archetype: gwt-maven-plugin:2.7.0 [INFO] ---------------------------------------------------------------------------- [INFO] Parameter: groupId,Value: com.mytest [INFO] Parameter: artifactId,Value: gwtmvntest [INFO] Parameter: version,Value: 1.0-SNAPSHOT [INFO] Parameter: package,Value: com.mytest.gwtmvntest [INFO] Parameter: packageInPathFormat,Value: com/mytest/gwtmvntest [INFO] Parameter: package,Value: com.mytest.gwtmvntest [INFO] Parameter: version,Value: 1.0-SNAPSHOT [INFO] Parameter: module,Value: GwtMvnTest [INFO] Parameter: groupId,Value: gwtmvntest [INFO] project created from Archetype in dir: /private/tmp/mvn/gwtmvntest [INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESS [INFO] ------------------------------------------------------------------------ [INFO] Total time: 08:12 min [INFO] Finished at: 2015-01-14T12:59:17+01:00 [INFO] Final Memory: 15M/310M [INFO] ------------------------------------------------------------------------
Here's how I compile my project:
mvn compile gwt:compile [INFO] Scanning for projects... [INFO] [INFO] ------------------------------------------------------------------------ [INFO] Building GWT Maven Archetype 1.0-SNAPSHOT [INFO] ------------------------------------------------------------------------ [INFO] [INFO] --- gwt-maven-plugin:2.7.0:generateAsync (default) @ gwtmvntest --- [INFO] [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ gwtmvntest --- [INFO] Using 'UTF-8' encoding to copy filtered resources. [INFO] Copying 2 resources [INFO] [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ gwtmvntest --- [INFO] Changes detected - recompiling the module! [INFO] Compiling 6 source files to /private/tmp/mvn/gwtmvntest/target/gwtmvntest-1.0-SNAPSHOT/WEB-INF/classes [INFO] [INFO] --- gwt-maven-plugin:2.7.0:compile (default-cli) @ gwtmvntest --- [INFO] Compiling module com.mytest.gwtmvntest.GwtMvnTest [INFO] Compiling 5 permutations [INFO] Compiling permutation 0... [INFO] Process output [INFO] Compiling [INFO] Compiling permutation 4... [INFO] Process output [INFO] Compiling [INFO] Compiling permutation 3... [INFO] Process output [INFO] Compiling [INFO] Compiling permutation 2... [INFO] Process output [INFO] Compiling [INFO] Compiling permutation 1... [INFO] Compile of permutations succeeded [INFO] Compilation succeeded -- 13.866s [INFO] Linking into /private/tmp/mvn/gwtmvntest/target/gwtmvntest-1.0-SNAPSHOT/GwtMvnTest [INFO] Link succeeded [INFO] Linking succeeded -- 0.171s [INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESS [INFO] ------------------------------------------------------------------------ [INFO] Total time: 18.228 s [INFO] Finished at: 2015-01-14T13:07:07+01:00 [INFO] Final Memory: 22M/310M [INFO] ------------------------------------------------------------------------
Here's how I run the project:
mvn gwt:run-codeserver [INFO] Scanning for projects... [INFO] [INFO] ------------------------------------------------------------------------ [INFO] Building GWT Maven Archetype 1.0-SNAPSHOT [INFO] ------------------------------------------------------------------------ [INFO] [INFO] >>> gwt-maven-plugin:2.7.0:run-codeserver (default-cli) > process-classes @ gwtmvntest >>> [INFO] [INFO] --- gwt-maven-plugin:2.7.0:generateAsync (default) @ gwtmvntest --- [INFO] [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ gwtmvntest --- [INFO] Using 'UTF-8' encoding to copy filtered resources. [INFO] Copying 2 resources [INFO] [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ gwtmvntest --- [INFO] Nothing to compile - all classes are up to date [INFO] [INFO] <<< gwt-maven-plugin:2.7.0:run-codeserver (default-cli) < process-classes @ gwtmvntest <<< [INFO] [INFO] --- gwt-maven-plugin:2.7.0:run-codeserver (default-cli) @ gwtmvntest --- [INFO] Turning off precompile in incremental mode. [INFO] Super Dev Mode starting up [INFO] workDir: /var/folders/nk/58gyq85x7l3_mzb5rc0gw42w0000gn/T/gwt-codeserver-5859907708379954718.tmp [INFO] Loading Java files in com.mytest.gwtmvntest.GwtMvnTest. [INFO] Module setup completed in 11742 ms [ERROR] 2015-01-14 13:14:35.800:INFO:oejs.Server:jetty-8.y.z-SNAPSHOT [ERROR] 2015-01-14 13:14:35.833:INFO:oejs.AbstractConnector:Started SelectChannelConnector@127.0.0.1:9876 [INFO] [INFO] The code server is ready at http://localhost:9876/
Solution
With GWT 2.7, you only need to start MVN GWT: run, which will use superdevmode under the cover to "recompile and load" (instead of bookmarklet)
That said, unless your project is very simple, you should start using different Maven modules for client and server code as soon as possible; This is because Maven insists that you cannot manage "GWT client classpath" and "server classpath" in the same POM I released prototypes to help set up everything: https://github.com/tbroyer/gwt-maven-archetypes (unfortunately, I don't have time to update them to GWT 2.7) either that or using gradle