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With the latest update to java-1.8.0-openjdk (java-1.8.0-openjdk-headless-1.8.0.91-0.b14.el6_7.x86_64) all JSP compilation for tomcat6 is broken. The workaround for the problem is to revert the java update to a previously stable release.

The reason for the problem is that ECJ's JDTCompiler classes have some sort of incompatibility with the OpenJDK update's java.io.ObjectInputStream class. This compatibility issue is causing an exception and preventing JSPs from compiling on tomcat6. See attached bug (https://bugzilla.redhat.com/show_bug.cgi?id=1223609#c13) for more details on this.

Is it possible to rebase ECJ to at least 4.4 to correct this?

Yeah, the fix for "S8144430, CVE-2016-3427: Improve JMX connections" adds:

+    static {
+        SharedSecrets.setJavaObjectInputStreamAccess(ObjectInputStream::setValidator);
+    }

to java.io.ObjectInputStream. We had to remove this for the OpenJDK 7 backport.

It's mainly luck if you've managed to use a Java 8 class library with a compiler that doesn't support Java 8 so far. This is only going to get worse on subsequent updates, as Oracle show no sign of avoiding using Java 8 features. Tomcat either needs to use the OpenJDK 7 class library or ecj needs to be upgraded.

Assigning to Elliott to study the effects of an ECJ update and then update it as appropriate.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2017-0566.html