title: Maven says "Cannot find symbol" when trying to build it
body: <p>Im trying to build a webapp in jenkins using maven, but it keeps saying that a couple of symbols couldnt be find.</p>
  <p>I've checked both JAVA_HOME and MAVEN_HOME, and they are correctly set in Jenkins configs.</p>
  <p>If someone knows anything that could help, i'd be grateful.</p>
  <p><strong>The command that i'm running on Maven:</strong></p>
  <p><code>mvn clean package</code></p>
  <p><strong>The errors presented:</strong></p>
  <pre><code>[INFO] BUILD FAILURE
  [INFO] ------------------------------------------------------------------------
  [INFO] Total time:  1.931 s
  [INFO] Finished at: 2020-08-10T23:03:14-03:00
  [INFO] ------------------------------------------------------------------------
  [ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.0:compile (default-compile) on project marvin: Compilation failure: Compilation failure: 
  [ERROR] /home/luan/Downloads/teste/golden/src/main/java/br/ufrj/info/golden/core/persistence/StudentJPADAO.java:[18,46] cannot find symbol
  [ERROR]   symbol:   class Student_
  [ERROR]   location: package br.ufrj.info.golden.core.domain
  </code></pre>