The following test failed in the JDK15 CI:

applications/ctw/modules/java_desktop_2.java

Here's a snippet from the log file:

----------System.err:(25/1768)----------
There were 1 errors:[
java.lang.Error: modules_java_desktop_2748: failed during compilation of class #2815 : javax/swing/plaf/basic/BasicInternalFrameTitlePane
at sun.hotspot.tools.ctw.CtwRunner.startCtwforAllClasses(CtwRunner.java:217)
at sun.hotspot.tools.ctw.CtwRunner.run(CtwRunner.java:119)
at sun.hotspot.tools.ctw.CtwRunner.main(CtwRunner.java:65)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at com.sun.javatest.regtest.agent.MainActionHelper$AgentVMRunnable.run(MainActionHelper.java:298)
at java.base/java.lang.Thread.run(Thread.java:832)

java.lang.AssertionError: There were 1 errors:[{modules_java_desktop_2748: failed during compilation of class #2815 : javax/swing/plaf/basic/BasicInternalFrameTitlePane}]
at sun.hotspot.tools.ctw.CtwRunner.run(CtwRunner.java:134)
at sun.hotspot.tools.ctw.CtwRunner.main(CtwRunner.java:65)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at com.sun.javatest.regtest.agent.MainActionHelper$AgentVMRunnable.run(MainActionHelper.java:298)
at java.base/java.lang.Thread.run(Thread.java:832)

JavaTest Message: Test threw exception: java.lang.AssertionError
JavaTest Message: shutting down test

result: Failed. Execution failed: `main' threw exception: java.lang.AssertionError: There were 1 errors:[{modules_java_desktop_2748: failed during compilation of class #2815 : javax/swing/plaf/basic/BasicInternalFrameTitlePane}]