Re: java.lang.NoClassDefFoundError: org/slf4j/LoggerFactory

On Wednesday, May 1, 2013 8:50:57 PM UTC+2, Kris wrote:

ok, I will try to get solution 2 to work..

I am a little confused about how to set... 

In the properties of the project -> Google -> Web Application -> WAR directory ( here I have src/main/webapp )... 

and Launch and deploy from this directory. (disabled because this is a Maven project)

In the properties of the project -> Java Build Path -> Source -> Default output folder... what should I have here... 

target/<myapp>/WEB-INF/classes

 

Here is part of my pom.xml

<properties>

<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

<!-- Convenience property to set the GWT version -->

<errai.version>2.2.0.Final</errai.version>

<webappDirectory>${project.build.directory}/${project.build.finalName}</webappDirectory>

<gwtVersion>2.5.1</gwtVersion>

</properties>

<plugins>

<plugin>

<groupId>org.apache.maven.plugins</groupId>

<artifactId>maven-compiler-plugin</artifactId>

<version>3.0</version>

<configuration>

<encoding>UTF-8</encoding>

<verbose>true</verbose>

<source>1.7</source>

<target>1.7</target>

Be careful, GWT only supports Java 6 sources.

(mixing client-side and server-side in the same Maven module is an anti-pattern to begin with, but not impossible).

 

</configuration>

</plugin>

<!-- GWT Maven Plugin -->

<plugin>

<groupId>org.codehaus.mojo</groupId>

<artifactId>gwt-maven-plugin</artifactId>

<version>2.5.1</version>

<executions>

<execution>

<goals>

<goal>compile</goal>

<goal>test</goal>

<goal>i18n</goal>

<goal>generateAsync</goal>

</goals>

</execution>

</executions>

<!-- Plugin configuration. There are many available options, see gwt-maven-plugin 

documentation at codehaus.org -->

<configuration>

<runTarget>ppmock.html</runTarget>

<hostedWebapp>${webappDirectory}</hostedWebapp>

Remove that line unless you really know what you're doing (you're actually not using it anyway, as you're not using "mvn gwt:run")

 

<i18nMessagesBundle>com.farheap.jsi.ppmock.client.GUIConstants</i18nMessagesBundle>

<gwtSdkFirstInClasspath>true</gwtSdkFirstInClasspath>

</configuration>

</plugin>

<plugin>

<groupId>org.apache.maven.plugins</groupId>

<artifactId>maven-war-plugin</artifactId>

<version>2.3</version>

<configuration>

<webappDirectory>${webappDirectory}</webappDirectory>

<packagingExcludes>WEB-INF/lib/*.jar</packagingExcludes>

<archive>

<manifest>

<addClasspath>false</addClasspath>

</manifest>

</archive>

</configuration>

</plugin>

With that configuration, you'll never have any JAR in WEB-INF/lib, so that won't work.

You have to move that to a profile so you can easily disable it (but then be very careful when releasing your app; changing the produced artifact with profiles is an anti-pattern, though very useful in GWT's case, but for other use-cases)

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