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maven-hello-world's Introduction

A simple, minimal Maven example: hello world

To create the files in this git repo we've already run mvn archetype:generate from http://maven.apache.org/guides/getting-started/maven-in-five-minutes.html

mvn archetype:generate -DgroupId=com.mycompany.app -DartifactId=my-app -DarchetypeArtifactId=maven-archetype-quickstart -DinteractiveMode=false

Now, to print "Hello World!", type either...

cd my-app
mvn compile
java -cp target/classes com.mycompany.app.App

or...

cd my-app
mvn package
java -cp target/my-app-1.0-SNAPSHOT.jar com.mycompany.app.App

Running mvn clean will get us back to only the source Java and the pom.xml:

murphy:my-app pdurbin$ mvn clean --quiet
murphy:my-app pdurbin$ ack -a -f
pom.xml
src/main/java/com/mycompany/app/App.java
src/test/java/com/mycompany/app/AppTest.java

Running mvn compile produces a class file:

murphy:my-app pdurbin$ mvn compile --quiet
murphy:my-app pdurbin$ ack -a -f
pom.xml
src/main/java/com/mycompany/app/App.java
src/test/java/com/mycompany/app/AppTest.java
target/classes/com/mycompany/app/App.class
murphy:my-app pdurbin$ 
murphy:my-app pdurbin$ java -cp target/classes com.mycompany.app.App
Hello World!

Running mvn package does a compile and creates the target directory, including a jar:

murphy:my-app pdurbin$ mvn clean --quiet
murphy:my-app pdurbin$ mvn package > /dev/null
murphy:my-app pdurbin$ ack -a -f
pom.xml
src/main/java/com/mycompany/app/App.java
src/test/java/com/mycompany/app/AppTest.java
target/classes/com/mycompany/app/App.class
target/maven-archiver/pom.properties
target/my-app-1.0-SNAPSHOT.jar
target/surefire-reports/com.mycompany.app.AppTest.txt
target/surefire-reports/TEST-com.mycompany.app.AppTest.xml
target/test-classes/com/mycompany/app/AppTest.class
murphy:my-app pdurbin$ 
murphy:my-app pdurbin$ java -cp target/my-app-1.0-SNAPSHOT.jar com.mycompany.app.App
Hello World!

Running mvn clean compile exec:java requires http://mojo.codehaus.org/exec-maven-plugin/

Running java -jar target/my-app-1.0-SNAPSHOT.jar requires http://maven.apache.org/plugins/maven-shade-plugin/

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maven-hello-world's Issues

Checker not working on Java 7

Checker is working great with Java 8 (see 3c08628) but I can't get it working with Java 7.

Locally I made the following change to the pom.xml to switch from Java 8 to Java 7...

[pdurbin@tabby my-app]$ git diff
diff --git a/my-app/pom.xml b/my-app/pom.xml
index d998204..9e64242 100644
--- a/my-app/pom.xml
+++ b/my-app/pom.xml
@@ -10,7 +10,7 @@

   <properties>
       <!-- This property will be set by the Maven Dependency plugin -->
-      <annotatedJdk>${org.checkerframework:jdk8:jar}</annotatedJdk>
+      <annotatedJdk>${org.checkerframework:jdk7:jar}</annotatedJdk>
   </properties>

   <dependencies>
@@ -32,7 +32,7 @@
     </dependency>
     <dependency>
         <groupId>org.checkerframework</groupId>
-        <artifactId>jdk8</artifactId>
+        <artifactId>jdk7</artifactId>
         <version>1.9.4</version>
     </dependency>
   </dependencies>
@@ -92,8 +92,8 @@
       <plugin>
           <artifactId>maven-compiler-plugin</artifactId>
           <configuration>
-              <source>1.8</source>
-              <target>1.8</target>
+              <source>1.7</source>
+              <target>1.7</target>
               <fork>true</fork>
               <!-- Add all the checkers you want to enable here -->
               <annotationProcessors>
[pdurbin@tabby my-app]$

... but it's not working. I'm getting this error:

[pdurbin@pdurbin my-app]$ mvn package -e
[INFO] Error stacktraces are turned on.
[INFO] Scanning for projects...
[WARNING] 
[WARNING] Some problems were encountered while building the effective model for com.mycompany.app:my-app:jar:1.0-SNAPSHOT
[WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-compiler-plugin is missing. @ line 92, column 15
[WARNING] 
[WARNING] It is highly recommended to fix these problems because they threaten the stability of your build.
[WARNING] 
[WARNING] For this reason, future Maven versions might no longer support building such malformed projects.
[WARNING] 
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building my-app 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] --- maven-dependency-plugin:2.3:properties (default) @ my-app ---
[INFO] 
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ my-app ---
[WARNING] Using platform encoding (UTF-8 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] skip non existing resourceDirectory /home/pdurbin/github/pdurbin/maven-hello-world/my-app/src/main/resources
[INFO] 
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ my-app ---
[INFO] Changes detected - recompiling the module!
[WARNING] File encoding has not been set, using platform encoding UTF-8, i.e. build is platform dependent!
[INFO] Compiling 1 source file to /home/pdurbin/github/pdurbin/maven-hello-world/my-app/target/classes
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 4.560 s
[INFO] Finished at: 2015-08-21T18:33:59-04:00
[INFO] Final Memory: 9M/23M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project my-app: Compilation failure -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project my-app: Compilation failure
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:212)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80)
    at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:307)
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193)
    at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106)
    at org.apache.maven.cli.MavenCli.execute(MavenCli.java:862)
    at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:286)
    at org.apache.maven.cli.MavenCli.main(MavenCli.java:197)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
Caused by: org.apache.maven.plugin.compiler.CompilationFailureException: Compilation failure
    at org.apache.maven.plugin.compiler.AbstractCompilerMojo.execute(AbstractCompilerMojo.java:862)
    at org.apache.maven.plugin.compiler.CompilerMojo.execute(CompilerMojo.java:129)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:208)
    ... 20 more
[ERROR] 
[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/MojoFailureException
[pdurbin@tabby my-app]$

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