WTP Releng BREEs

To get a list of the current Bundle-RequiredExecutionEnvironments (BREEs) used in WTP, run find.sh in a folder where you have the webtools projects checked out from git.

find.sh . "*.MF" Bundle-RequiredExecutionEnvironment | grep Bundle-RequiredExecutionEnvironment | \
  sed -e "s#[0-9]\+:Bundle-RequiredExecutionEnvironment: \(.\+\)#\1#" | \
  sort > /tmp/BREEs.txt && dos2unix /tmp/BREEs.txt
for n in 4 5 6 7 8 9 10; do
  echo -n $(cat /tmp/BREEs.txt | uniq | grep $n)" x "; cat /tmp/BREEs.txt | grep $n | wc -l
done

As of 2018-05-27, these BREEs appear this many times:

J2SE-1.4 x 51
J2SE-1.5 x 169
JavaSE-1.6 x 43
JavaSE-1.7 x 12
JavaSE-1.8 x 123

Toolchains

In order for the above BREEs to be rigidly enforced at compile time, you can build WTP using toolchains:

mvn clean install --global-toolchains ${WORKSPACE}/.maven/repo/toolchains.xml -t ${WORKSPACE}/.maven/repo/toolchains.xml

Here's a sample toolchains.xml file:

 <?xml version="1.0" encoding="UTF8"?>
 <toolchains>
   <toolchain>
     <type>jdk</type>
     <provides>
       <version>1.8</version>
       <vendor>openjdk</vendor>
     </provides>
     <configuration>
       <jdkHome>/usr/lib/jvm/java-1.8.0-openjdk/</jdkHome>
     </configuration>
   </toolchain>
   <toolchain>
     <type>jdk</type>
     <provides>
       <version>9</version>
       <vendor>openjdk</vendor>
     </provides>
     <configuration>
       <jdkHome>/usr/lib/jvm/java-9-openjdk/</jdkHome>
     </configuration>
   </toolchain>
  </toolchains>