[jbosstools-issues] [JBoss JIRA] (JBIDE-25894) Evaluate providing Java EE support as jdt.ls extensions

[Mickael Istria (JIRA)]

    [ https://issues.jboss.org/browse/JBIDE-25894?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13555111#comment-13555111 ] 

Mickael Istria commented on JBIDE-25894:
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I couldn't resist giving it a quick try:

About installation and size; I only used the usual UI and have an empty workspace, which is included in measures:
Took full Eclipse IDE for Java EE Developers Photon.M6, 409MB
Added JBoss Tools support for CDI, Jax-RS and Hibernate (contributing to JDT and so to JDT-LS): +165MB
Added JDT-LS from http://download.eclipse.org/jdtls/snapshots/repository/latest : +6MB
For a total of 580MB disk footprint. Of course, it can be trimmed down as it includes the whole UI layer not need for a LS, and it also includes Hibernate Tools which come with a plethora of dependencies.

Then I tried to start the JDT-LS app with
{quote}
/usr/bin/java -Declipse.application=org.eclipse.jdt.ls.core.id1 -Dosgi.bundles.defaultStartLevel=4 -Declipse.product=org.eclipse.jdt.ls.core.product -Dlog.level=ALL -noverify -Xmx1G -jar ./plugins/org.eclipse.equinox.launcher_1.5.0.v20180207-1446.jar -configuration ./config_linux -data /home/mistria/sandbox/eclipse-jee-photon-M6-linux-gtk-x86_64/eclipse/ls-data
{quote}
But startup failed with
{quote}
!ENTRY org.eclipse.osgi 4 0 2018-04-03 16:15:42.648
!MESSAGE An error occurred while automatically activating bundle org.eclipse.jdt.ls.core (945).
!STACK 0
org.osgi.framework.BundleException: Exception in org.eclipse.jdt.ls.core.internal.JavaLanguageServerPlugin.start() of bundle org.eclipse.jdt.ls.core.
  at org.eclipse.osgi.internal.framework.BundleContextImpl.startActivator(BundleContextImpl.java:800)
  at org.eclipse.osgi.internal.framework.BundleContextImpl.start(BundleContextImpl.java:729)
  at org.eclipse.osgi.internal.framework.EquinoxBundle.startWorker0(EquinoxBundle.java:1002)
  at org.eclipse.osgi.internal.framework.EquinoxBundle$EquinoxModule.startWorker(EquinoxBundle.java:354)
{quote}
Version of org.eclipse.jdt.core.manipulation in my "JBoss Tools language server" is 1.10.0.v20180302-1956

[~fbricon] Which version of Eclipse JDT is supposed to be used for JDT-LS?



> Evaluate providing Java EE support as jdt.ls extensions
> -------------------------------------------------------
>
>                 Key: JBIDE-25894
>                 URL: https://issues.jboss.org/browse/JBIDE-25894
>             Project: Tools (JBoss Tools)
>          Issue Type: Enhancement
>            Reporter: Mickael Istria
>
> Jdt-LS relies on JDT for most features.
> WTP and JBoss Tools do extend JDT to provide additional features, such as Jax-RS completion.
> It would be worth investigating whether just adding a few bundles from wtp and JBoss Tools into JDT-LS can turn JDT-LS into a powerful tool for Java EE as well, and to evaluate what must and can be improved to enable it.
> As a good Java EE support requires a good Java support first, it's very likely that extending JDT-LS (on demand) for Java EE is the most productive and efficient way to have a Java EE language-server.
> As Jakarta EE moves to Eclipse.org, there are some discussions to improve JEE tools in Eclipse IDE and in general. So building on top of WebTools/JBoss Tools and allowing webtools/jbosstools to run in JDT-LS wo uld fit in the community mindset and may attract 3rd-party contributors to Eclipse Webtools.



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