Java – Maven can’t compile using rt.jar

javamaven

My project uses sun.security.tools.keytool to generate certificate under JDK 1.8 and this package can be found in rt.jar. According to Introduction to the Dependency Mechanism, System Dependencies, I can add rt.jar as a dependency to my project:

<dependency>
  <groupId>sun.jdk</groupId>
  <artifactId>rt.jar</artifactId>
  <version>1.8</version>
  <scope>system</scope>
  <systemPath>${java.home}/lib/rt.jar</systemPath>
</dependency>

I'm pretty sure Maven found this jar file. However when I import sun.security.tools.keytool.Main, it still generates an error. Moreover, the most strange thing is if I copy rt.jar into someplace and fill its path in pom.xml, it works! As soon as I switch back to use the original rt.jar, it fails!

Can anyone tell me how could this happen?

Best Answer

I created a Maven project and added the <dependency> of your question to its POM.

First I got:

[ERROR] COMPILATION ERROR : 
[INFO] -------------------------------------------------------------
[ERROR] .../SO-31353565/src/main/java/igb/so/SO31353565.java:[6,34]
    package sun.security.tools.keytool does not exist
[ERROR] .../SO-31353565/src/main/java/igb/so/SO31353565.java:[12,50]
    cannot find symbol
  symbol:   variable Main
  location: class igb.so.SO31353565

Then, according to Cannot find symbol (CertAndKeyGen) with JDK8, I added:

<build>
  <pluginManagement>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.2</version>
        <configuration>
          <fork>true</fork>
          <compilerArgument>-XDignore.symbol.file</compilerArgument>
        </configuration>
      </plugin>
    </plugins>
  </pluginManagement>
</build>

to the POM and the compilation succeeded.

Related Solutions

Java – How to create an executable JAR with dependencies using Maven

<build>
  <plugins>
    <plugin>
      <artifactId>maven-assembly-plugin</artifactId>
      <configuration>
        <archive>
          <manifest>
            <mainClass>fully.qualified.MainClass</mainClass>
          </manifest>
        </archive>
        <descriptorRefs>
          <descriptorRef>jar-with-dependencies</descriptorRef>
        </descriptorRefs>
      </configuration>
    </plugin>
  </plugins>
</build>

and you run it with

mvn clean compile assembly:single

Compile goal should be added before assembly:single or otherwise the code on your own project is not included.

See more details in comments.

Commonly this goal is tied to a build phase to execute automatically. This ensures the JAR is built when executing mvn install or performing a deployment/release.

<plugin>
  <artifactId>maven-assembly-plugin</artifactId>
  <configuration>
    <archive>
      <manifest>
        <mainClass>fully.qualified.MainClass</mainClass>
      </manifest>
    </archive>
    <descriptorRefs>
      <descriptorRef>jar-with-dependencies</descriptorRef>
    </descriptorRefs>
  </configuration>
  <executions>
    <execution>
      <id>make-assembly</id> <!-- this is used for inheritance merges -->
      <phase>package</phase> <!-- bind to the packaging phase -->
      <goals>
        <goal>single</goal>
      </goals>
    </execution>
  </executions>
</plugin>

Java – JDK tools.jar as maven dependency

That's what profiles are for, extract the path to a property, setup profiles for windows, OSX, etc, and define the property values appropriately.

Here's the doc page that discussing profiles for OSes: Maven Local Settings Model

It should endup looking something like this:

  <profiles>
    <profile>
      <id>windows_profile</id>
      <activation>
        <os>
          <family>Windows</family>
        </os>
      </activation>
      <properties>
        <toolsjar>${java.home}/../lib/tools.jar</toolsjar>
      </properties>
    </profile>
    <profile>
      <id>osx_profile</id>
      <activation>
        <os>
          <family>mac</family>
        </os>
      </activation>
      <properties>
        <toolsjar>${java.home}/../Classes/classes.jar</toolsjar>
      </properties>
    </profile>
  </profiles>

Best Answer

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Java – How to create an executable JAR with dependencies using Maven

Java – JDK tools.jar as maven dependency

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