While compiling a scala project using maven (mvn compile) , I am getting error: java.lang.StackOverflowError.
I got the same from eclipse as well, but could solve it by giving Additional command line parameters: -J-Xss256m for scala compiler , as given here How to increase scala stack size
But I am getting the same error while doing "mvn compile". How can I solve this ? Basically how to increase scala stack size while building via maven
You can configure the scala-maven-plugin in the pom.xml like bellow
<project>
...
<plugin>
<groupId>net.alchim31.maven</groupId>
<artifactId>scala-maven-plugin</artifactId>
<version>3.2.1</version>
<executions>
<execution>
<goals>
<goal>compile</goal>
<goal>testCompile</goal>
</goals>
</execution>
</executions>
<configuration>
<jvmArgs>
<jvmArg>-Xms256m</jvmArg>
<jvmArg>-Xmx1024m</jvmArg>
</jvmArgs>
</configuration>
</plugin>
...
</project>
For more see http://davidb.github.io/scala-maven-plugin/example_compile.html
Related
pom.xml:
<build>
<sourceDirectory>src/main/scala</sourceDirectory>
<testSourceDirectory>src/test/scala</testSourceDirectory>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>${maven.compiler.source}</source>
<target>${maven.compiler.target}</target>
</configuration>
<executions>
<execution>
<id>default-compile</id>
<phase>compile</phase>
</execution>
</executions>
</plugin>
<plugin>
<!-- see http://davidb.github.com/scala-maven-plugin -->
<groupId>net.alchim31.maven</groupId>
<artifactId>scala-maven-plugin</artifactId>
<version>3.2.0</version>
<executions>
<execution>
<goals>
<goal>compile</goal>
<goal>testCompile</goal>
</goals>
<configuration>
<args>
<arg>-dependencyfile</arg>
<arg>${project.build.directory}/.scala_dependencies</arg>
</args>
</configuration>
</execution>
</executions>
</plugin>
Code structure:
src/main/java
Hello.java
src/main/scala #will reference the class under /src/main/java
App.scala
IDE : Intellij IDEA 2017.2.1 , JDK: java8
Issues :
when ever i run the maven compile via the intellij, it always show below errors, which means it can not find the Hello.class .
Questions:
why this pom.xml does not work ? I checked the doc of scal-maven-plugin, the layout should work, but it did not .
I found it will work if i add the src/main/java as source directory via the build-helper-maven-plugin. This may explain the first question, but i realized that before the maven compile, i run the App.scala via the Intellij , so the Hello.java has already been compiled to class and i could see it under the src/main/target/classes . So Why the scala-maven-plugin can not find the class under src/main/target/classes ?
like in the documentation/sample linked in the question, remove
<sourceDirectory>src/main/scala</sourceDirectory>
<testSourceDirectory>src/test/scala</testSourceDirectory>
or set them to src/.../java (the default values), no need to use the build-helper-maven-plugin
or place *.java and *.scala under the same directory (my favorite)
In dual mixed java/scala (scala depends on java and java depends of scala), the scala compiler run against java source, not from binary.
If you want to "notify" the IDE that scala source are under src/.../scala "add"
<goal>add-source</goal>
see add-source
I tried to look around a lot to solve this problem but I can't really solve it.
In my scala project i'm trying to build a fatjar with all the dependencies in it, so here is my pom:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>2.3</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<transformers>
<transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>com.my.project.start.CommandStarter</mainClass>
</transformer>
</transformers>
</configuration>
</execution>
</executions>
</plugin>
So i'm pointing to my main class, and in the manifest , inside the jar , i can see that the main class is there too..
But when i run my jar by launching : scala myjar.jar i have a
java.lang.ClassNotFoundException
Any suggestion?
Thank you!
I am trying to run a simple Scala Hello World program using scala-maven-plugin from the command line in my Ubuntu VM running in Win-7 host OS.
I tried to execute in the following two ways :-
mvn scala:run -DmainClass=com.infoobjects.HelloWorld
Declaring the main class in a launcher tag in pom.xml and then executing mvn scala:run from the command line
But I am getting ClassNotFoundException in either case.
Directory Structure :-
Project > src > main > scala > com > infoobjects > HelloWorld.scala
Thanks in advance.
Here's my pom.xml
<build>
<finalName>sparkplay</finalName>
<plugins>
<plugin>
<groupId>net.alchim31.maven</groupId>
<artifactId>scala-maven-plugin</artifactId>
<configuration>
<launchers>
<launcher>
<id>launcher1</id>
<mainClass>com.infoobjects.HelloWorld</mainClass>
</launcher>
</launchers>
<executions>
<execution>
<id>scala-compile-first</id>
<phase>process-resources</phase>
<goals>
<goal>add-source</goal>
<goal>compile</goal>
</goals>
</execution>
<execution>
<id>scala-test-compile</id>
<phase>process-test-resources</phase>
<goals>
<goal>testCompile</goal>
</goals>
</execution>
</executions>
</configuration>
</plugin>
</plugins>
</build>
your pom.xml has schema's issue : <executions> should not be child of <configuration>. So everything under <executions> is ignored
see Maven Model
Problem: I run mvn install on my GWT 2.5.0 project that I built with the gwt-maven-plugin and get the error Rebind result 'c3gw.fwk.gui.client.ClientFactory' must be a class.
This is a snippet of my pom.xml:
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>gwt-maven-plugin</artifactId>
<version>2.5.0</version>
<executions>
<execution>
<goals>
<goal>compile</goal>
<goal>test</goal>
<goal>i18n</goal>
<goal>resources</goal>
<goal>generateAsync</goal>
</goals>
</execution>
</executions>
<configuration>
<runTarget>C3gwGui.html</runTarget>
<hostedWebapp>${webappDirectory}</hostedWebapp>
<i18nMessagesBundle>c3gw.fwk.gui.client.Messages</i18nMessagesBundle>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>2.1.1</version>
<executions>
<execution>
<phase>compile</phase>
<goals>
<goal>exploded</goal>
</goals>
</execution>
</executions>
<configuration>
<webappDirectory>${webappDirectory}</webappDirectory>
</configuration>
</plugin>
This is a snippet of my C3gwGui.gwt.xml:
<replace-with class="c3gw.fwk.gui.client.ClientFactoryImpl">
<when-type-is class="c3gw.fwk.gui.client.ClientFactory" />
</replace-with>
This is a snippet of the line where the error is thrown:
public void onModuleLoad() {
ClientFactory clientFactory = GWT.create(ClientFactory.class);
...
}
ClientFactory is an interface and ClientFactoryImpl implements the interface.
What I've figured out so far: The code works perfectly fine in Eclipse when I run debug, it just doesn't work when I do mvn install. I've run all the goals available for gwt-maven-plugin (clean, compile, sources, etc...) and they all work so the only conclusion I can have at this point is that something is happening during the maven-war-plugin phase or much later.
I also took the basics of this code from the following google tutorial and they use an interface so it should work, assuming that the example project also works that is.
Removing war:exploded, as Thomas indicated, solved the issue.
I'm using Eclipse Indigo on Win XP, with Maven 3.0.3. I have created a Selenium 2 test that I wish to debug in Eclipse. It is set up to run in the Maven integration test phase. I'm using the Maven Cargo plugin with Tomcat as the container. Here's the relevant section from my pom.xml ...
<plugin>
<groupId>org.codehaus.cargo</groupId>
<artifactId>cargo-maven2-plugin</artifactId>
<configuration>
<container>
<containerId>tomcat${tomcat.major}x</containerId>
<zipUrlInstaller>
<url>http://archive.apache.org/dist/tomcat/tomcat-${tomcat.major}/v${tomcat.version}/bin/apache-tomcat-${tomcat.version}.tar.gz</url>
<downloadDir>${project.build.directory}/downloads</downloadDir>
<extractDir>${project.build.directory}/extracts</extractDir>
</zipUrlInstaller>
<output>${project.build.directory}/tomcat${tomcat.major}x.log</output>
<log>${project.build.directory}/cargo.log</log>
</container>
<configuration>
<home>${project.build.directory}/tomcat-${tomcat.version}/container</home>
<properties>
<cargo.logging>high</cargo.logging>
<cargo.servlet.port>8080</cargo.servlet.port>
</properties>
</configuration>
</configuration>
<executions>
<execution>
<id>start-container</id>
<phase>pre-integration-test</phase>
<goals>
<goal>start</goal>
<goal>deploy</goal>
</goals>
<configuration>
<deployer>
<deployables>
<deployable>
<groupId>${project.groupId}</groupId>
<artifactId>${project.artifactId}</artifactId>
<type>war</type>
<pingURL>http://localhost:8080/${project.artifactId}</pingURL>
<pingTimeout>30000</pingTimeout>
<properties>
<context>${project.artifactId}</context>
</properties>
</deployable>
</deployables>
</deployer>
</configuration>
</execution>
<execution>
<id>stop-container</id>
<phase>post-integration-test</phase>
<goals>
<goal>stop</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<configuration>
<!-- Skip the normal tests, we'll run them in the integration-test phase -->
<skip>true</skip>
</configuration>
<executions>
<execution>
<phase>integration-test</phase>
<goals>
<goal>test</goal>
</goals>
<configuration>
<skip>false</skip>
</configuration>
</execution>
</executions>
</plugin>
Problem is, when I right click on my integration test in Eclipse, select "Debug As" and then choose my Debug Configuration (which is just the maven goal "clean install -Dtest=TableIntegrationTest"), the execution runs without hitting the breakpoint I set (http://screencast.com/t/at0AKWwxslE). How can I do step-through debugging on a JUnit/Selenium integration test in Eclipse?
Maven's integration tests by default run in a forked JVM. Therefore, eclipse is unable to attach to the forked JVM and see the breakpoints.
You can force the integration-test to run in the same JVM with the -DforkMode=never option.
More here: http://maven.apache.org/surefire/maven-surefire-plugin/examples/fork-options-and-parallel-execution.html
Edit: Updated link