[Core] Changes to enable building with JDK17

Author: alexrobin

.github/workflows/gradle_build.yml

@@ -21,7 +21,7 @@ jobs:
     - name: Set up JDK 11
       uses: actions/setup-java@v3
       with:
-        java-version: '11'
+        java-version: '17'
         distribution: 'temurin'
     - name: Checkout
       uses: actions/checkout@v3

common.gradle

@@ -112,7 +112,7 @@ subprojects {
     // helper method to list all non-empty packages in jar
     ext.getPackagesFromJar = { jarFile, packageSet ->
       //println jarFile
-      FileSystems.newFileSystem(jarFile.toPath(), null).withCloseable { fs ->
+      FileSystems.newFileSystem(jarFile.toPath(), ClassLoader.getSystemClassLoader()).withCloseable { fs ->
           def rootDir = fs.getPath('/')
           getPackagesFromDir(rootDir, packageSet)
       }

gradle.properties

@@ -1 +1 @@
-org.gradle.jvmargs=-Xmx2048m -XX:MaxPermSize=512m
+org.gradle.jvmargs=-Xmx2048m -XX:MaxMetaspaceSize=512m

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.1.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.3.3-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists