Java modules not working with aspectj-maven-plugin

Java modules not working with aspectj-maven-plugin - java

I am trying to migrate my java project to 11 and using modules, but it seems that the aspectj compiler does not recognise modules from my maven dependencies?
Error:
mvn clean compile
[INFO] Scanning for projects...
[INFO]
[INFO] ---------------------------< com.test:test >----------------------------
[INFO] Building test 1
[INFO] --------------------------------[ jar ]---------------------------------
[INFO]
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) # test ---
[INFO] Deleting /Users/piotr/Documents/mvntest/target
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) # test ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory /Users/piotr/Documents/mvntest/src/main/resources
[INFO]
[INFO] --- maven-compiler-plugin:3.8.1:compile (default-compile) # test ---
[INFO] Required filename-based automodules detected: [passay-1.6.0.jar]. Please don't publish this project to a public artifact repository!
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 2 source files to /Users/piotr/Documents/mvntest/target/classes
[INFO]
[INFO] --- aspectj-maven-plugin:1.12.6:compile (default) # test ---
[INFO] Showing AJC message detail for messages of types: [error, warning, fail]
[ERROR] passay cannot be resolved to a module
/Users/piotr/Documents/mvntest/src/main/java/module-info.java:2
requires passay;
^
[ERROR] Must declare a named package because this compilation unit is associated to the named module 'test'
/Users/piotr/Documents/mvntest/src/main/java/main.java:1
(no source information available)
[ERROR] The type org.passay.PasswordValidator is not accessible
/Users/piotr/Documents/mvntest/src/main/java/main.java:1
import org.passay.PasswordValidator;
^^^^^^^^^^^^^^^^^^^^^^^^^^^
[ERROR] PasswordValidator cannot be resolved to a type
/Users/piotr/Documents/mvntest/src/main/java/main.java:5
System.out.println(new PasswordValidator());
^^^^^^^^
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2.169 s
[INFO] Finished at: 2020-12-14T10:22:00+01:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal com.nickwongdev:aspectj-maven-plugin:1.12.6:compile (default) on project test: AJC compiler errors:
[ERROR] error at requires passay;
[ERROR] ^
[ERROR] /Users/piotr/Documents/mvntest/src/main/java/module-info.java:2:0::0 passay cannot be resolved to a module
[ERROR] error at (no source information available)
[ERROR] /Users/piotr/Documents/mvntest/src/main/java/main.java:1:0::0 Must declare a named package because this compilation unit is associated to the named module 'test'
[ERROR] error at import org.passay.PasswordValidator;
[ERROR] ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[ERROR] /Users/piotr/Documents/mvntest/src/main/java/main.java:1:0::0 The type org.passay.PasswordValidator is not accessible
[ERROR] error at System.out.println(new PasswordValidator());
[ERROR] ^^^^^^^^
[ERROR] /Users/piotr/Documents/mvntest/src/main/java/main.java:5:0::0 PasswordValidator cannot be resolved to a type
[ERROR]
[ERROR] -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException
pom.xml:
<?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>com.test</groupId>
<artifactId>test</artifactId>
<packaging>jar</packaging>
<version>1</version>
<properties>
<java.version>11</java.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<aspectj.version>1.9.6</aspectj.version>
</properties>
<dependencies>
<dependency>
<groupId>org.passay</groupId>
<artifactId>passay</artifactId>
<version>1.6.0</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjrt</artifactId>
<version>${aspectj.version}</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.1</version>
<configuration>
<release>${java.version}</release>
</configuration>
</plugin>
<plugin>
<groupId>com.nickwongdev</groupId>
<artifactId>aspectj-maven-plugin</artifactId>
<version>1.12.6</version>
<dependencies>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjtools</artifactId>
<version>${aspectj.version}</version>
</dependency>
</dependencies>
<configuration>
<complianceLevel>${java.version}</complianceLevel>
<weaveMainSourceFolder>true</weaveMainSourceFolder>
</configuration>
<executions>
<execution>
<goals>
<goal>compile</goal>
<goal>test-compile</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
src/main/java/module-info.java:
module test {
requires passay;
}
src/main/java/main.java:
import org.passay.PasswordValidator;
public class main {
public static void main() {
System.out.println(new PasswordValidator());
}
}

In order for this to work the AspectJ Maven plugin would have to support at least the command line parameter --module-info for the AspectJ compiler ajc, analogous to javac. That the parameter exists is not documented in the ajc command line help but indirectly in the AspectJ 1.9.0 release notes.
I have never worked with Java 9+ modules before, even though I use recent Java versions for other reasons. I had to experiment a bit in order to find out how to compile and run your project from the command line, and basically it was something like this:
ajc -11 --module-path "C:\Users\alexa\.m2\repository\org\passay\passay\1.6.0\passay-1.6.0.jar" -cp "C:\Users\alexa\.m2\repository\org\aspectj\aspectjrt\1.9.6\aspectjrt-1.9.6.jar" -sourceroots src\main\java -outjar target\test-1.jar
java --module-path target\test-1.jar;C:\Users\alexa\.m2\repository\org\passay\passay\1.6.0\passay-1.6.0.jar;C:\Users\alexa\.m2\repository\org\aspectj\aspectjrt\1.9.6\aspectjrt-1.9.6.jar --module test/de.scrum_master.stackoverflow.q65286736.Application
Sorry, but I have moved your main class outside the default package like this (the main method was also pseudo code without any parameters):
module test {
requires passay;
}
package de.scrum_master.stackoverflow.q65286736;
import org.passay.PasswordValidator;
public class Application {
public static void main(String[] args) {
System.out.println(new PasswordValidator());
}
}
Then I experimentally added a parameter javaModules to the plugin, as you can see here in my pull request. Feel free to build it yourself by cloning my repository fork.
Then modify your POM like this:
<?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>com.test</groupId>
<artifactId>test</artifactId>
<packaging>jar</packaging>
<version>1</version>
<properties>
<java.version>11</java.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<aspectj.version>1.9.6</aspectj.version>
</properties>
<dependencies>
<dependency>
<groupId>org.passay</groupId>
<artifactId>passay</artifactId>
<version>1.6.0</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjrt</artifactId>
<version>${aspectj.version}</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.1</version>
<configuration>
<release>${java.version}</release>
<useIncrementalCompilation>false</useIncrementalCompilation>
</configuration>
</plugin>
<plugin>
<groupId>com.nickwongdev</groupId>
<artifactId>aspectj-maven-plugin</artifactId>
<version>1.12.7-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjtools</artifactId>
<version>${aspectj.version}</version>
</dependency>
</dependencies>
<configuration>
<complianceLevel>${java.version}</complianceLevel>
<encoding>${project.build.sourceEncoding}</encoding>
<!--<weaveMainSourceFolder>true</weaveMainSourceFolder>-->
<showWeaveInfo>true</showWeaveInfo>
<Xlint>ignore</Xlint>
<!--<verbose>true</verbose>-->
<!--<warn>constructorName,packageDefaultMethod,deprecation,maskedCatchBlocks,unusedLocals,unusedArguments,unusedImport</warn>-->
<!--<argumentFileName>argumentFileName.txt</argumentFileName>-->
<javaModules>
<javaModule>
<groupId>org.passay</groupId>
<artifactId>passay</artifactId>
</javaModule>
</javaModules>
</configuration>
<executions>
<execution>
<phase>process-sources</phase>
<goals>
<goal>compile</goal>
<goal>test-compile</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
The decisive difference is of course the usage of the new parameter:
<javaModules>
<javaModule>
<groupId>org.passay</groupId>
<artifactId>passay</artifactId>
</javaModule>
</javaModules>
Now the project compiles and you can also run the application with the second command I posted above, i.e. java --module-path target\test-1.jar;.... For me IntelliJ IDEA recognised the new parameter in its POM syntax highlighting and also runs the application without any problems.
This is not full support for all Java module related parameters you can think of, but I think it is a starting point. Feedback welcome.

Related

I cannot compile my javafx maven project on Raspberry pi

I created a java project which compiles and runs fine on my mac with "mvn compile". But once I fetch it from gitlab on my Pi it won't compile on linux.
I consulted many pages but none seem to apply to this particular issue.
Can anyone help me? I would be really grateful!
The error:
[INFO] Scanning for projects...
[INFO]
[INFO] ----------------------< SmartMirror:SmartMirror >-----------------------
[INFO] Building SmartMirror 0.0.1-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 4.816 s
[INFO] Finished at: 2022-07-23T14:54:44+02:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal on project SmartMirror: Could not resolve dependencies for project SmartMirror:SmartMirror:jar:0.0.1-SNAPSHOT: The following artifacts could not be resolved: org.openjfx:javafx-controls:jar:${javafx.platform}:19-ea+9, org.openjfx:javafx-graphics:jar:${javafx.platform}:19-ea+9, org.openjfx:javafx-base:jar:${javafx.platform}:19-ea+9, org.openjfx:javafx-fxml:jar:${javafx.platform}:19-ea+9: Failure to find org.openjfx:javafx-controls:jar:${javafx.platform}:19-ea+9 in https://repo.maven.apache.org/maven2 was cached in the local repository, resolution will not be reattempted until the update interval of central has elapsed or updates are forced -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/DependencyResolutionException
The POM.xml file:
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>SmartMirror</groupId>
<artifactId>SmartMirror</artifactId>
<version>0.0.1-SNAPSHOT</version>
<properties>
<mainClass>main.Main</mainClass>
<maven.compiler.source>1.9</maven.compiler.source>
<maven.compiler.target>1.9</maven.compiler.target>
<javafx.platform>linux</javafx.platform>
</properties>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>3.3.0</version>
<executions>
<execution>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<shadedArtifactAttached>true</shadedArtifactAttached>
<transformers>
<transformer
implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>main.Main</mainClass>
</transformer>
</transformers>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.10.1</version>
</plugin>
<plugin>
<groupId>org.openjfx</groupId>
<artifactId>javafx-maven-plugin</artifactId>
<version>0.0.8</version>
<configuration>
<mainClass>Main</mainClass>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<!-- https://mvnrepository.com/artifact/org.openjfx/javafx-controls -->
<dependency>
<groupId>org.openjfx</groupId>
<artifactId>javafx-controls</artifactId>
<version>19-ea+9</version>
<classifier>linux</classifier>
</dependency>
<!-- https://mvnrepository.com/artifact/org.openjfx/javafx-fxml -->
<dependency>
<groupId>org.openjfx</groupId>
<artifactId>javafx-fxml</artifactId>
<version>19-ea+9</version>
<classifier>linux</classifier>
</dependency>
<dependency>
<groupId>com.mashape.unirest</groupId>
<artifactId>unirest-java</artifactId>
<version>1.4.9</version>
</dependency>
</dependencies>
</project>
The module-info.java file:
module SmartMirror {
exports weather to javafx.graphics, javafx.fxml;
exports main to javafx.graphics, javafx.fxml;
opens weather to javafx.graphics, javafx.fxml;
opens main to javafx.graphics, javafx.fxml;
requires javafx.base;
requires javafx.controls;
requires javafx.fxml;
requires transitive javafx.graphics;
requires transitive json;
}
Edit:
Thank you so far for your answers. Though the issue persists. Any more ideas?

I used this command on Raspberry Pi 3B (Raspberry Pi OS lite 32bit) :
mvn -Djavafx.platform=linux-arm32-monocle clean compile
if you use 64bit version :
mvn -Djavafx.platform=linux-aarch64-monocle clean compile

Maven build failure classNotFoundException

It's my first time trying out maven and I can't understand why I keep getting classnotfoundexception every time I am trying to build. This is the error I am receiving:
[INFO] Scanning for projects...
[INFO]
[INFO] ---------------------------< owmapi:owmapi >----------------------------
[INFO] Building OwmAPICase 0.0.1-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO]
[INFO] --- exec-maven-plugin:3.0.0:java (default-cli) # owmapi ---
[WARNING]
java.lang.ClassNotFoundException: owmapi.Main
at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:435)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:589)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
at org.codehaus.mojo.exec.ExecJavaMojo$1.run(ExecJavaMojo.java:246)
at java.base/java.lang.Thread.run(Thread.java:832)
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.582 s
[INFO] Finished at: 2021-02-28T14:09:17+01:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.codehaus.mojo:exec-maven-plugin:3.0.0:java (default-cli) on project owmapi: An exception occured while executing the Java class. owmapi.Main -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException
And this is my pom.xml:
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>owmapi</groupId> <!-- case.se.ctk -->
<artifactId>owmapi</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>OwmAPICase</name>
<properties>
<maven.compiler.source>1.7</maven.compiler.source>
<maven.compiler.target>1.7</maven.compiler.target>
</properties>
<build>
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>3.0.0</version>
<configuration>
<mainClass>owmapi.Main</mainClass>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/net.aksingh/owm-japis -->
<dependency>
<groupId>net.aksingh</groupId>
<artifactId>owm-japis</artifactId>
<version>2.5.3.0</version>
</dependency>
</dependencies>
</project>
Everything works fine if i simply run the project as a java application in eclipse but for some reason it won't work with maven. I guess the problem lies in mainClass in my pom but I've tried several solutions to no avail.

I think your main class have some dependencies on the jar mentioned in the pom.xml. You're simply creating a target jar which doesn't have those dependencies included. You need to create the uber/fat jar which include all the relevant dependencies. You can use this following plugin maven-assembly-plugin for creating the target jar.
Assumption: Main.java class is under package owmapi.
<build>
<finalName>owmapi</finalName>
<plugins>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
<configuration>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<mainClass>owmapi.Main</mainClass>
</manifest>
</archive>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
</plugin>
</plugins>
</build>

Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project grpc_hello_server: Compilation failure

I'm trying to create a gRPC service with Java using below codelab.
I created a sample proto file. While compiling the .proto using maven, i got a build failure error. It says javax.annotation.Generated anottation class is not found.
Could you help me find the root cause of the issue and steps to fix it. I feel it should be a versioning issue but not clear on how to solve it.
https://codelabs.developers.google.com/codelabs/cloud-grpc-java/index.html?index=..%2F..index#2
Errors:
[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] /home/grpc_hello_server/target/generated-sources/protobuf/grpc-java/com/example/grpc/GreetingServiceGrpc.java:[20,18] cannot find symbol
symbol: class Generated
location: package javax.annotation
[INFO] 1 error
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 9.845 s
[INFO] Finished at: 2020-06-29T16:56:21-07:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project grpc_hello_server: Compilation failure
[ERROR] /home/grpc_hello_server/target/generated-sources/protobuf/grpc-java/com/example/grpc/GreetingServiceGrpc.java:[20,18] cannot find symbol
[ERROR] symbol: class Generated
[ERROR] location: package javax.annotation
[ERROR]
[ERROR] -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException.
pom.xml
<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>com.example.grpc</groupId>
<artifactId>grpc_hello_server</artifactId>
<packaging>jar</packaging>
<version>1.0-SNAPSHOT</version>
<name>grpc_hello_server</name>
<url>http://maven.apache.org</url>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>io.grpc</groupId>
<artifactId>grpc-netty</artifactId>
<version>1.7.0</version>
</dependency>
<dependency>
<groupId>io.grpc</groupId>
<artifactId>grpc-protobuf</artifactId>
<version>1.7.0</version>
</dependency>
<dependency>
<groupId>io.grpc</groupId>
<artifactId>grpc-stub</artifactId>
<version>1.7.0</version>
</dependency>
</dependencies>
<properties>
<maven.compiler.source>1.6</maven.compiler.source>
<maven.compiler.target>1.6</maven.compiler.target>
</properties>
<build>
<extensions>
<extension>
<groupId>kr.motd.maven</groupId>
<artifactId>os-maven-plugin</artifactId>
<version>1.6.2</version>
</extension>
</extensions>
<plugins>
<plugin>
<groupId>org.xolstice.maven.plugins</groupId>
<artifactId>protobuf-maven-plugin</artifactId>
<version>0.5.0</version>
<configuration>
<protocArtifact>com.google.protobuf:protoc:3.4.0:exe:${os.detected.classifier}</protocArtifact>
<pluginId>grpc-java</pluginId>
<pluginArtifact>io.grpc:protoc-gen-grpc-java:1.7.0:exe:${os.detected.classifier}</pluginArtifact>
</configuration>
<executions>
<execution>
<goals>
<goal>compile</goal>
<goal>compile-custom</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>

Issue is due to missing dependency in pom.xml for Java 9+
<dependency> <!-- necessary for Java 9+ -->
<groupId>org.apache.tomcat</groupId>
<artifactId>annotations-api</artifactId>
<version>6.0.53</version>
<scope>provided</scope>
</dependency>

Any reason you are using Java 1.6?
<maven.compiler.source>1.6</maven.compiler.source>
<maven.compiler.target>1.6</maven.compiler.target>
Can you change it to 1.7 and see if it works?

Could not find goal 'devmode' in plugin org.codehaus.mojo

I am a beginner in GWT and Maven. I created a new GWT Application project in Eclipse. Then, I converted that project into Maven Project by right-click on Project name => Configure => Convert to Maven Project and I saw that a pom file was generated for that project. Next, I run as project as Maven build but it was not compiled since a goal was not specified there. Actually, I don't understand what exactly have I to write under that goal section, therefore, I wrote package under that and then again I built maven and it compiled successfully.
After that, I tried to run this maven project in Command Prompt on the SuperDevMode using the 2nd step mentioned on Run the GWT Project under the Setting up a new project section. But while following these steps on Command Prompt, I got an error that devmode could not be found. Here is my Command prompt log:
C:\Users\TEST>cd eclipse-workspace/MyWebApp
C:\Users\TEST\eclipse-workspace\MyWebApp>mvn war:exploded
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building MavenApp 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-war-plugin:3.1.0:exploded (default-cli) # abcdef ---
[INFO] Exploding webapp
[INFO] Assembling webapp [abcdef] in [C:\Users\TEST\eclipse-workspace\MyWebApp\target\abcdef-0.0.1-SNAPSHOT]
[INFO] Processing war project
[INFO] Webapp assembled in [63 msecs]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.920 s
[INFO] Finished at: 2017-08-30T11:24:53+05:30
[INFO] Final Memory: 12M/107M
[INFO] ------------------------------------------------------------------------
C:\Users\TEST\eclipse-workspace\MyWebApp>mvn gwt:devmode
[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.301 s
[INFO] Finished at: 2017-08-30T11:25:02+05:30
[INFO] Final Memory: 8M/107M
[INFO] ------------------------------------------------------------------------
[ERROR] Could not find goal 'devmode' in plugin org.codehaus.mojo:gwt-maven-plugin:2.8.1 among available goals clean, compile, compile-report, css, debug, eclipse, eclipseTest, generateAsync, help, i18n, mergewebxml, resources, run, run-codeserver, source-jar, test -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoNotFoundException
Here is my pom.xml file:
<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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>MyWebApp</groupId>
<artifactId>abcdef</artifactId>
<version>0.0.1-SNAPSHOT</version>
<build>
<sourceDirectory>src</sourceDirectory>
<testSourceDirectory>test</testSourceDirectory>
<resources>
<resource>
<directory>src</directory>
<excludes>
<exclude>**/*.java</exclude>
</excludes>
</resource>
</resources>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.6.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
<name>MavenApp</name>
<description>It is a maven app</description>
</project>
I searched a lot to resolve this error but found no solution for that issue. Please help me to fix this issue as I am very confused on how to fix it.
Edit: After further study, I used mvn gwt:run as an alternative to the command mvn gwt:devmode, but still I got another error on command prompt as given below:
[ERROR] Failed to execute goal org.codehaus.mojo:gwt-maven-plugin:2.8.1:run (default-cli) on project MyWebApp: The parameters 'runTarget' for goal org.codehaus.mojo:gwt-maven-plugin:2.8.1:run are missing or invalid

Without any more information than gwt:devmode, Maven will try to find an appropriate plugin, based on its default settings. It happens that a gwt-maven-plugin exists with org.codehaus.mojo as groupId, fitting in Maven built-in plugin resolution.
But this is not the plugin you're looking for.
You are probably trying to use this one, so just add this to your pom.xml, in the <plugins> section:
<plugin>
<groupId>net.ltgt.gwt.maven</groupId>
<artifactId>gwt-maven-plugin</artifactId>
<version>1.0-rc-8</version>
<extensions>true</extensions>
<configuration>
<moduleName>com.example.app.App</moduleName>
</configuration>
</plugin>
Adapting the moduleName if needed.

Well, I was able to solve this issue by copying some dependencies, plugin, and configuration from the pom.xml file (which is generated in the project created by the webAppCreator using maven) to the pom.xml file of my project created in the Eclipse. So, this is my pom.xml file created finally:
<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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>MyPersonalProject</groupId>
<artifactId>MyPersonalProject</artifactId>
<version>0.0.1-SNAPSHOT</version>
<properties>
<!-- Setting maven.compiler.source to something different to 1.8
needs that you configure the sourceLevel in gwt-maven-plugin since
GWT compiler 2.8 requires 1.8 (see gwt-maven-plugin block below) -->
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<!-- Don't let your Mac use a crazy non-standard encoding -->
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
</properties>
<dependencyManagement>
<dependencies>
<!-- ensure all GWT deps use the same version (unless overridden) -->
<dependency>
<groupId>com.google.gwt</groupId>
<artifactId>gwt</artifactId>
<version>2.8.1</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>com.google.gwt</groupId>
<artifactId>gwt-servlet</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>com.google.gwt</groupId>
<artifactId>gwt-user</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.google.gwt</groupId>
<artifactId>gwt-dev</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<outputDirectory>${project.build.directory}/${project.build.finalName}/WEB-INF/classes</outputDirectory>
<sourceDirectory>src</sourceDirectory>
<testSourceDirectory>test</testSourceDirectory>
<resources>
<resource>
<directory>src</directory>
<excludes>
<exclude>**/*.java</exclude>
</excludes>
</resource>
</resources>
<plugins>
<plugin>
<groupId>net.ltgt.gwt.maven</groupId>
<artifactId>gwt-maven-plugin</artifactId>
<version>1.0-rc-6</version>
<executions>
<execution>
<goals>
<goal>import-sources</goal>
<goal>compile</goal>
<goal>import-test-sources</goal>
<goal>test</goal>
</goals>
</execution>
</executions>
<configuration>
<moduleName>mypackage.MyPersonalproject</moduleName>
<failOnError>true</failOnError>
<!-- GWT compiler 2.8 requires 1.8, hence define sourceLevel here if you use
a different source language for java compilation -->
<sourceLevel>1.8</sourceLevel>
<!-- Compiler configuration -->
<compilerArgs>
<!-- Ask GWT to create the Story of Your Compile (SOYC) (gwt:compile) -->
<arg>-compileReport</arg>
<arg>-XcompilerMetrics</arg>
</compilerArgs>
<!-- DevMode configuration -->
<warDir>${project.build.directory}/${project.build.finalName}</warDir>
<classpathScope>compile+runtime</classpathScope>
<!-- URL(s) that should be opened by DevMode (gwt:devmode). -->
<startupUrls>
<startupUrl>MyPersonalProject.html</startupUrl>
</startupUrls>
</configuration>
</plugin>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.6.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
</project>
When I run this application using maven in the Command Prompt, it ran successfully except showing 2 or 3 warnings in the Command Prompt log. Also, I noticed that the SNAPSHOT generated in the version is different for the pom.xml created by Eclipse as compared to the one created by the maven project on command prompt.

Error running project in eclipse wtih maven "Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile" [duplicate]

This question already has answers here:
How to set specific Java version to Maven?
(28 answers)
Closed 8 years ago.
I'm learning google app engine programs with eclipse and maven but I've been stuck on this error since 2 days. I've looked everywhere on the internet but couldn't get a solution to my problem.
Here's the console output
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building helloworld 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] >>> appengine-maven-plugin:1.9.4:devserver (default-cli) > package # helloworld >>>
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) # helloworld ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory /Users/AdioJack/Developer/Scalable Apps (Udacity)/ud859-master/Lesson_2/000_Hello_Endpoints/src/main/resources
[INFO]
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) # helloworld ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 3 source files to /Users/AdioJack/Developer/Scalable Apps (Udacity)/ud859-master/Lesson_2/000_Hello_Endpoints/target/helloworld-1.0-SNAPSHOT/WEB-INF/classes
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2.462 s
[INFO] Finished at: 2014-09-10T12:34:38+05:30
[INFO] Final Memory: 6M/81M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project helloworld: Fatal error compiling: invalid target release: 1.7 -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException
and here's the pom.xml
<?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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<packaging>war</packaging>
<version>1.0-SNAPSHOT</version>
<groupId>com.google.training.helloworld</groupId>
<artifactId>helloworld</artifactId>
<properties>
<appengine.app.version>1</appengine.app.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<prerequisites>
<maven>3.1.0</maven>
</prerequisites>
<dependencies>
<!-- Compile/runtime dependencies -->
<dependency>
<groupId>com.google.appengine</groupId>
<artifactId>appengine-api-1.0-sdk</artifactId>
<version>1.9.4</version>
</dependency>
<dependency>
<groupId>com.google.appengine</groupId>
<artifactId>appengine-endpoints</artifactId>
<version>1.9.4</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.inject</groupId>
<artifactId>javax.inject</artifactId>
<version>1</version>
</dependency>
<!-- Test Dependencies -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.google.appengine</groupId>
<artifactId>appengine-testing</artifactId>
<version>1.9.4</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.google.appengine</groupId>
<artifactId>appengine-api-stubs</artifactId>
<version>1.9.4</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<!-- for hot reload of the web application-->
<outputDirectory>${project.build.directory}/${project.build.finalName}/WEB-INF/classes</outputDirectory>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<version>3.1</version>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>2.4</version>
<configuration>
<webXml>${project.build.directory}/generated-sources/appengine-endpoints/WEB-INF/web.xml</webXml>
<webResources>
<resource>
<!-- this is relative to the pom.xml directory -->
<directory>${project.build.directory}/generated-sources/appengine-endpoints</directory>
<!-- the list has a default value of ** -->
<includes>
<include>WEB-INF/*.discovery</include>
<include>WEB-INF/*.api</include>
</includes>
</resource>
</webResources>
</configuration>
</plugin>
<plugin>
<groupId>com.google.appengine</groupId>
<artifactId>appengine-maven-plugin</artifactId>
<version>1.9.4</version>
<configuration>
<enableJarClasses>false</enableJarClasses>
<!-- Comment in the below snippet to bind to all IPs instead of just localhost -->
<!-- address>0.0.0.0</address>
<port>8080</port -->
<!-- Comment in the below snippet to enable local debugging with a remove debugger
like those included with Eclipse or IntelliJ -->
<!-- jvmFlags>
<jvmFlag>-agentlib:jdwp=transport=dt_socket,address=8000,server=y,suspend=n</jvmFlag>
</jvmFlags -->
</configuration>
<executions>
<execution>
<goals>
<goal>endpoints_get_discovery_doc</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
Here's java & maven version information
Apache Maven 3.2.3 (33f8c3e1027c3ddde99d3cdebad2656a31e8fdf4; 2014-08-12T02:28:10+05:30)
Maven home: /usr/local/Cellar/maven/3.2.3/libexec
Java version: 1.8.0_20, vendor: Oracle Corporation
Java home: /Library/Java/JavaVirtualMachines/jdk1.8.0_20.jdk/Contents/Home/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "mac os x", version: "10.10", arch: "x86_64", family: "mac"
This question is different from
How to set specific java version to Maven
I've only 1 version of java installed i.e. JDK 8
This is the command I ran in terminal to make maven is using latest java version
export JAVA_HOME=$(/usr/libexec/java_home)

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project helloworld: Fatal error compiling: invalid target release: 1.7 -> [Help 1]
If you look at the error, its complaining about an JDK7. Make sure you are using correct version of Java to be able to compile the application. You need atleast jdk1.7 (or higher).
As the question is tagged for eclipse, you can also set the available java compilers in the 'installeded JREs' option inside eclipse
Apart from that, you can also set the compliance level inside the pom of the project as below
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<source>1.7</source> <!-- or 1.8 -->
<target>1.7</target> <!-- or 1.8 -->
</configuration>
</plugin>

You have to install java 7 for the compile to work, however, java 8 and newer should also work

Develop Reference

Java is a programming language and computing platform first released by Sun Microsystems in 1995.

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