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| Working with JREs |
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| <h1> |
| Working with JREs |
| </h1> |
| <p> |
| You can <a href="../tasks/task-add_new_jre.htm">install</a> as many |
| different Java Runtime Environments (JREs) as you like. JREs are used to |
| run and debug java programs. Your JREs are managed on the <a href= |
| "../reference/preferences/java/debug/ref-installed_jres.htm">Installed |
| JREs</a> preference page. |
| </p> |
| |
| <p> |
| A JRE definition consists of: |
| </p> |
| <ul> |
| <li>The type of the JRE (e.g. Standard VM or Standard 1.x.x VM) |
| </li> |
| <li>A name |
| </li> |
| <li>The location where the JRE is installed |
| </li> |
| <li>The system libraries containing the Java system classes (like |
| java.lang.Object). Optionally, the system libraries can be associated |
| with: |
| <ul> |
| <li>the <a href="../reference/ref-properties-source-attachment.htm">source file</a> |
| containing the source for the classes in the JRE's CLASS files</li> |
| <li>a javadoc location (URL)</li> |
| <li><a href="../tasks/task-using_external_null_annotations.htm">external annotations</a>.</li> |
| </ul> |
| </li> |
| |
| <li>Other information needed by the VM to build, run and debug |
| applications. |
| </li> |
| </ul> |
| <p> |
| You can <a href="../tasks/task-assign_default_jre.htm">switch</a> the |
| default JRE for the workbench. The default JRE is used by default when |
| building, running, and debugging applications. Alternatively, projects |
| may <a href="../tasks/task-choose_config_jre.htm">specify</a> a specific |
| JRE that they should be built and run with. |
| </p> |
| |
| <h3 class="related">Related concepts</h3> |
| <a href="../concepts/concept-jdt.htm">Java development tools (JDT)</a> |
| |
| <h3 class="related">Related tasks</h3> |
| <a href="../tasks/task-add_new_jre.htm">Adding a new JRE |
| definition</a><br /> |
| <a href="tasks-deleteJRE.htm">Deleting a JRE definition</a><br /> |
| <a href="../tasks/task-assign_default_jre.htm">Choosing a default |
| JRE</a><br /> |
| <a href="../tasks/task-choose_config_jre.htm">Choosing a JRE for |
| launching a project</a> |
| |
| <h3 class="related">Related references</h3> |
| <a href= |
| "../reference/preferences/java/debug/ref-installed_jres.htm">Installed |
| JREs preference page</a> |
| </body> |
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