Cannot run custom rule class in eclipse

[Suman alungh]

I am trying to run the sample PMD custom rule as described in http://pmd.sourceforge.net/pmd-5.3.2/customizing/howtowritearule.html#Write_a_rule_class and I am unable to compile/run it in eclipse. I am not sure what is missing. I added the external PMD jar files on my project to get rid of import issues but I just can't run it. Can anyone please help or give me a sample rule that runs on eclipse. I am a beginner and I want a sample that works. I basically needs to compile the .java rule file sothat I get a .class file that I can eventually convert to jar to use that rule in Jenkins with Gradle.

import net.sourceforge.pmd.lang.ast.;
import net.sourceforge.pmd.lang.java.ast.;
import net.sourceforge.pmd.lang.java.rule.*;

public class WhileLoopsMustUseBracesRule extends AbstractJavaRule {
public Object visit(ASTWhileStatement node, Object data) {
Node firstStmt = node.jjtGetChild(1);
if (!hasBlockAsFirstChild(firstStmt)) {
addViolation(data, node);
}
return super.visit(node,data);
}
private boolean hasBlockAsFirstChild(Node node) {
return (node.jjtGetNumChildren() != 0 && (node.jjtGetChild(0) instanceof ASTBlock));
}
}

[Mamoon Rasheed]

@Suman I am also facing difficulty in building pmd-apex in order to develop new rule. I am getting error for pmd-apex-jorje is missing for pmd-apex module. Please let me know incase you find any solution to the same.