[jboss-jira] [JBoss JIRA] (DROOLS-5388) Eclipse Rule Editor does not recognize Java source level

[Stefan Winkler (Jira)]

     [ https://issues.redhat.com/browse/DROOLS-5388?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Stefan Winkler updated DROOLS-5388:
-----------------------------------
    Steps to Reproduce: 
# Using the Eclipse Installer, install Eclipse for Java and DSL developers 2020-03 or 2020-06.
# Then install the org.drools.eclipse plugin from https://download.jboss.org/drools/release/7.36.0.Final/org.drools.updatesite/
# Create a new Drools Project (File > New > Project > Drools Project) and select the option to generate the project using sample files.
# Open drools-test/src/main/resources/com/sample/rules/Sample.drl in the Rule Editor.
# To the {{then}} block add the following line of code and save the file: 

{{Stream.of(m).forEach(System.out::println);}}

*Expected:* no error marker appears

*Observed:* error marker appears saying the lambdas can only be used in source level 1.8+



  was:
# Using the Eclipse Installer, install Eclipse for Java and DSL developers 2020-03 or 2020-06.
# Then install the org.drools.eclipse plugin from https://download.jboss.org/drools/release/7.36.0.Final/org.drools.updatesite/
# Create a new Drools Project (File > New > Project > Drools Project) and select the option to generate the project using sample files.
# Open drools-test/src/main/resources/com/sample/rules/Sample.drl in the Rule Editor.
# To the `then` block add the following line of code and save the file: 

`Stream.of(m).forEach(System.out::println);`

*Expected:* no error marker appears

*Observed:* error marker appears saying the lambdas can only be used in source level 1.8+





> Eclipse Rule Editor does not recognize Java source level
> --------------------------------------------------------
>
>                 Key: DROOLS-5388
>                 URL: https://issues.redhat.com/browse/DROOLS-5388
>             Project: Drools
>          Issue Type: Bug
>          Components: eclipse plugin
>    Affects Versions: 7.36.0.Final
>            Reporter: Stefan Winkler
>            Assignee: Kris Verlaenen
>            Priority: Major
>
> See this stackoverflow:
> https://stackoverflow.com/q/62062516/2239897
> In an Eclipse 2020-03 or 2020-06 installation, when the org.drools.eclipse 7.36.0.Final plugin is installed, a .drl file containing Java 1.5+ source code shows error markers about unsupported Java syntax.
> Plugin org.drools.eclipse version 7.21.0.Final with an otherwise identical Eclipse installation works fine. There seems to be a regression introduced somewhere between 7.21.0  and 7.36.0.



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