GWT maven project with server side dependencies - gwt

Question

I have a maven GWT project under eclipse and since I added some server side dependencies the maven plugin doesn't compile anymore. Here follows more info about the context:
maven 3.0.3;
GWT 1.5.3;
GWT maven plugin org.codehaus.mojo:gwt-maven-plugin:1.2 (the latest compatible with GWT 1.5.3, http://mojo.codehaus.org/gwt-maven-plugin-1.2/).
The goal gwt:compile of the GWT maven plugin completes successfully if I don't add dependencies other than the GWT ones:
<dependency>
<groupId>com.google.gwt</groupId>
<artifactId>gwt-servlet</artifactId>
<version>${gwt.version}</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>com.google.gwt</groupId>
<artifactId>gwt-user</artifactId>
<version>${gwt.version}</version>
<scope>provided</scope>
</dependency>
When I add any other dependency, the goal gwt:compile fails:
[INFO] establishing classpath list (scope = compile)
[ERROR] Exception in thread "main" java.lang.NoSuchMethodError: org.eclipse.jdt.internal.compiler.Compiler.<init>(Lorg/eclipse/jdt/internal/compiler/env/INameEnvironment;Lorg/eclipse/jdt/internal/compiler/IErrorHandlingPolicy;Lorg/eclipse/jdt/internal/compiler/impl/CompilerOptions;Lorg/eclipse/jdt/internal/compiler/ICompilerRequestor;Lorg/eclipse/jdt/internal/compiler/IProblemFactory;)V
[ERROR] at com.google.gwt.dev.javac.JdtCompiler$CompilerImpl.<init>(JdtCompiler.java:93)
[ERROR] at com.google.gwt.dev.javac.JdtCompiler.<init>(JdtCompiler.java:231)
[ERROR] at com.google.gwt.dev.javac.JdtCompiler.compile(JdtCompiler.java:193)
[ERROR] at com.google.gwt.dev.javac.CompilationState.compile(CompilationState.java:115)
[ERROR] at com.google.gwt.dev.GWTCompiler.distill(GWTCompiler.java:327)
[ERROR] at com.google.gwt.dev.GWTCompiler.run(GWTCompiler.java:564)
[ERROR] at com.google.gwt.dev.GWTCompiler.run(GWTCompiler.java:554)
[ERROR] at com.google.gwt.dev.GWTCompiler.main(GWTCompiler.java:214)
I did search a configuration parameter about classpath/dependencies in the gwt:compile (http://mojo.codehaus.org/gwt-maven-plugin-1.2/compile-mojo.html) with no success.
I would like to use server side dependencies alongside GWT ones telling the GWT plugin to not consider the non-GWT dependencies.
working pom (gwt:compile completes successfully):
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>mygroupid</groupId>
<artifactId>projectname</artifactId>
<packaging>war</packaging>
<version>1.0-SNAPSHOT</version>
<name>project name</name>
<organization>
<name>My company</name>
<url>my company url</url>
</organization>
<properties>
<gwt.version>1.5.3</gwt.version>
</properties>
<build>
<finalName>final name</finalName>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.5</source>
<target>1.5</target>
<encoding>UTF-8</encoding>
</configuration>
<version>2.5.1</version>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-eclipse-plugin</artifactId>
<configuration>
<ajdtVersion>none</ajdtVersion>
</configuration>
<version>2.9</version>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>gwt-maven-plugin</artifactId>
<version>1.2</version>
<executions>
<execution>
<goals>
<goal>compile</goal>
</goals>
</execution>
</executions>
<configuration>
<runTarget>org.mycompany.myproject.Main/welcomeGWT.html</runTarget>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>2.2</version>
<configuration>
<warSourceDirectory>war</warSourceDirectory>
<webXml>src/main/webapp/WEB-INF/web.xml</webXml>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<!-- GWT -->
<dependency>
<groupId>com.google.gwt</groupId>
<artifactId>gwt-servlet</artifactId>
<version>${gwt.version}</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>com.google.gwt</groupId>
<artifactId>gwt-user</artifactId>
<version>${gwt.version}</version>
<scope>provided</scope>
</dependency>
</dependencies>
</project>
not working pom (gwt:compile throws exception):
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>mygroupid</groupId>
<artifactId>projectname</artifactId>
<packaging>war</packaging>
<version>1.0-SNAPSHOT</version>
<name>project name</name>
<organization>
<name>My company</name>
<url>my company url</url>
</organization>
<properties>
<gwt.version>1.5.3</gwt.version>
</properties>
<build>
<finalName>final name</finalName>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.5</source>
<target>1.5</target>
<encoding>UTF-8</encoding>
</configuration>
<version>2.5.1</version>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-eclipse-plugin</artifactId>
<configuration>
<ajdtVersion>none</ajdtVersion>
</configuration>
<version>2.9</version>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>gwt-maven-plugin</artifactId>
<version>1.2</version>
<executions>
<execution>
<goals>
<goal>compile</goal>
</goals>
</execution>
</executions>
<configuration>
<runTarget>org.mycompany.myproject.Main/welcomeGWT.html</runTarget>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>2.2</version>
<configuration>
<warSourceDirectory>war</warSourceDirectory>
<webXml>src/main/webapp/WEB-INF/web.xml</webXml>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>org.apache.ibatis</groupId>
<artifactId>ibatis-sqlmap</artifactId>
<version>2.3.4.726</version>
</dependency>
<dependency>
<groupId>net.sf.jasperreports</groupId>
<artifactId>jasperreports</artifactId>
<version>3.6.0</version>
</dependency>
<!-- GWT -->
<dependency>
<groupId>com.google.gwt</groupId>
<artifactId>gwt-servlet</artifactId>
<version>${gwt.version}</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>com.google.gwt</groupId>
<artifactId>gwt-user</artifactId>
<version>${gwt.version}</version>
<scope>provided</scope>
</dependency>
</dependencies>
</project>

Answer 1

Are you using JasperReport in our project? I remember having a problem using JasperReport and GWT. JasperReport includes a different version of the org.eclipse.jdt.internal.compiler.Compiler than what GWT is expecting.
I think you can fix this by simply changing the order of the class path (was already suggested in the comments). If that does not help, try to update your GWT version. Or try to find a version of JasperReport which includes a version of the org.eclipse.jdt.internal.compiler.Compile class that works with GWT.

Answer 2

I faced a similar error in our QA Linux environment during deployment of our web application and we managed to fix it. This problem wasn't even there when I deployed into my local Windows 10 and Linux Ubuntu virtual machine. My environment configuration is as follows
Ubuntu 16.04 LTS
Apache Maven 3.3.3
Apache Tomcat/8.0.32 (Ubuntu)
JVM 1.8.0_91-8u91-b14-0ubuntu4~16.04.1-b14
The problem was because there were two eclipse Compiler classes that were found in two different jar files, and this creates conflicts in the classpath during tomcat deployment. The culprits are files ecj.jar and jdtcore.jar
My original pom.xml snipet is as below
<dependency>
<groupId>org.drools</groupId>
<artifactId>drools-compiler</artifactId>
<version>6.3.0.Final</version>
</dependency>
<dependency>
<groupId>net.sourceforge.dynamicreports</groupId>
<artifactId>dynamicreports-core</artifactId>
<version>3.1.3</version>
</dependency>
The Maven dependency tree for drools-compiler introduces ecj.jar file.
The Maven dependency for dynamicreports-core.jar file that has jasperreports.jar that in turn introduces jdtcore.jar file.
Solution:
We upgraded the version of dynamicreports-core that introduces jasperreports.jar file.
Note:
I was able to fix this issue after reading http://www.cnblogs.com/xiaoMzjm/p/4566672.html. Credits to this blogger.
<dependency>
<groupId>net.sourceforge.dynamicreports</groupId>
<artifactId>dynamicreports-core</artifactId>
<version>4.1.0</version>
</dependency>