rc7 devmode vs rc8 devmode

[Waxolunist]

When starting devmode from the reactor project with following line rc7 works and rc8 not:

mvn gwt:devmode -pl <gwt-app-projectname> -am 

With rc8 I get following error:

[WARNING] Error: Could not find or load main class com.google.gwt.dev.DevMode

The difference is in the classpath:

rc7 classpath:

<projectpath>/<gwt-app>/src/main/java:
<projectpath>/<gwt-app>/target/generated-sources/annotations:
<projectpath>/<gwt-lib>/src/main/java:
<projectpath>/<gwt-lib>/target/generated-sources/annotations:
<projectpath>/<gwt-app>/target/<gwt-app>/WEB-INF/classes:
<home>/.m2/repository/com/google/gwt/gwt-dev/2.8.1/gwt-dev-2.8.1.jar:<home>/.m2/repository/com/google/code/gson/gson/2.6.2/gson-2.6.2.jar:
<all other maven deps>

rc8 classpath:

<projectpath>/<gwt-app>/src/main/java:
<projectpath>/<gwt-app>/target/generated-sources/annotations:
<projectpath>/<gwt-lib>/src/main/java:
<projectpath>/<gwt-lib>/target/generated-sources/annotations:
<projectpath>/<gwt-app>/target/<gwt-app>/WEB-INF/classes:

In rc8 all maven jars are missing.

[tbroyer]

Could it be a dupe of #91? I haven't gotten to release a rc9 yet.

[Waxolunist]

That is maybe the same. I just tested with 1.0-SNAPSHOT and I get following error

[ERROR] Failed to execute goal net.ltgt.gwt.maven:gwt-maven-plugin:1.0-SNAPSHOT:add-super-sources (default-add-super-sources) on project gwt-common: Execution default-add-super-sources of goal net.ltgt.gwt.maven:gwt-maven-plugin:1.0-SNAPSHOT:add-super-sources failed: An API incompatibility was encountered while executing net.ltgt.gwt.maven:gwt-maven-plugin:1.0-SNAPSHOT:add-super-sources: java.lang.NoSuchMethodError: org.codehaus.plexus.util.StringUtils.isBlank(Ljava/lang/String;)Z

I am using maven 3.3.9, the latest on debian stable

[tbroyer]

Could you run Maven with debug logs (mvn -X) and isolate the portion where it populates the class realm for the plugin? (should begin with a line like “[DEBUG] Populating class realm plugin>net.ltgt.gwt.maven:gwt-maven-plugin:1.0-SNAPSHOT”, the lines above should be in "tree" view, the lines below the flat list of dependencies added to the plugin classloader)

[Waxolunist]

I ran now the devmode with -X option on java 8 and maven 3.3.9:

Populating class realm extension>net.ltgt.gwt.maven:gwt-maven-plugin:1.0-SNAPSHOT
[DEBUG]   Included: net.ltgt.gwt.maven:gwt-maven-plugin:jar:1.0-SNAPSHOT
[DEBUG]   Included: org.codehaus.plexus:plexus-utils:jar:1.1
[DEBUG] Extension realms for project com.payolution:gwt-common:gwt-lib:1.10.0-SNAPSHOT: [ClassRealm[extension>net.ltgt.gwt.maven:gwt-maven-plugin:1.0-SNAPSHOT, parent: sun.misc.Launcher$AppClassLoader@5c647e05]]
[DEBUG] Created new class realm project>com.payolution:gwt-common:1.10.0-SNAPSHOT
[DEBUG] Populating class realm project>com.payolution:gwt-common:1.10.0-SNAPSHOT
[DEBUG] Looking up lifecyle mappings for packaging gwt-lib from ClassRealm[project>com.payolution:gwt-common:1.10.0-SNAPSHOT, parent: ClassRealm[maven.api, parent: null]]
[DEBUG] Extension realms for project com.payolution:collection-portal-ui:gwt-app:1.6.0-SNAPSHOT: [ClassRealm[extension>net.ltgt.gwt.maven:gwt-maven-plugin:1.0-SNAPSHOT, parent: sun.misc.Launcher$AppClassLoader@5c647e05]]
[DEBUG] Looking up lifecyle mappings for packaging gwt-app from ClassRealm[project>com.payolution:gwt-common:1.10.0-SNAPSHOT, parent: ClassRealm[maven.api, parent: null]]
[INFO] ------------------------------------------------------------------------

The isBlank method exists only since 1.5.2

[tbroyer]

OK, so, plexus-utils 1.1 is automatically added by Maven when it doesn't find plexus-utils as a dependency of the plugin (backwards compat' with Maven 1 (sic!)). This means your POM for the gwt-maven-plugin is corrupt. Clean your local repo and/or force redownload with -U (might not redownload, might only check for new version, and thus keep your corrupt POM)

[Waxolunist]

You are right. I was missing the pom file. Somehow nexus did not download the pom file.
I can now confirm, that devmode is working for me with rc7 and 1.0-SNAPSHOT but not rc8.
I will now use the snapshot version and as soon as rc9 is released will use that one.
Thank you for your help.