[IGNITE-8146] JDK9: IgniteUtils classLoaderUrls() JDK9 bug

• Type: Bug
• Status: Resolved
• Priority: Trivial
• Resolution: Fixed
• Affects Version/s: 2.4
• Fix Version/s: 2.7
• Component/s: general
• Labels: jdk9
• Flags: Patch
• Assignee: Taras Ledkov
• Reporter: Sujit Kumar Mahapatra
• Created: 05/Apr/18 11:16
• Updated: 27/Sep/18 13:12
• Resolved: 27/Sep/18 13:09

Description

Reporting a probable miss that breaks JDK9 compatibility.

As part of this commit  in ignite/modules/core/src/main/java/org/apache/ignite/internal/util/IgniteUtils.java, below lines will throw ClassCastException in JDK9 during runtime.

return ((URLClassLoader)urlClsLdrField.get(clsLdr)).getURLs();

 

Here, urlClsLdrField.get(clsLdr) return an object of type "__java.base/jdk.internal.loader.URLClassPath" which can't be cast to "URLClassLoader".

 

The fix seems to be to introduce another reflection call to invoke getURLs  method of the internal URLClassPath class.

Issue Links

• blocks: IGNITE-9684 JDK9: pass JVM options to created process at HadoopCommandLineTest#createProcessBuilder
• Is contained by: IGNITE-8441 Java 9/10/11 Support [2.5-2.7]
• Is contained by: IGNITE-9670 JDK9: supports hadoop Ignite module
• links to: GitHub Pull Request #4826
• links to: Tests results