Changing static final field results in "Caused by: java.lang.IllegalAccessError: Update to static final field"

[dmigowski]

Hello,

I am using hotswap agent with great success but when I change a static final field in a class I get this exception:

java.lang.reflect.InvocationTargetException
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
	at org.hotswap.agent.plugin.jvm.ClassInitPlugin$2.executeCommand(ClassInitPlugin.java:130)
	at org.hotswap.agent.command.impl.CommandExecutor.run(CommandExecutor.java:43)
Caused by: java.lang.IllegalAccessError: Update to static final field de.ikoffice.app.primaform.control.PrimaformOvertimeManager.overtimeAbsence3 attempted from a different method ($$ha$clinit) than the initializer method <clinit> 
	at de.ikoffice.app.primaform.control.PrimaformOvertimeManager.$$ha$clinit(Unknown Source)
	... 6 more

This wasn't an issue with JRebel, but the reason for this is probably that they unfinal all the fields automatically. Is there anything I can do except for removing the final modifier during development? Thanks in advance.

It seems like removing the final modifiers for a class during reload is a possible solution.

[skybber]

Hi,

thanks for report. May be we can fix ClassInitPlugin and clear FINAL modifier using the following approach:

            haClinit.instrument(
                new ExprEditor() {
                    public void edit(FieldAccess f) throws CannotCompileException {
                        try {
                            if (f.isStatic() && f.isWriter()) {
// clear FINAL code:
                                f.getField().setModifiers(f.getField().getModifiers() & ~Modifier.FINAL);

Could you please check if this resolves the issue in your case? Let me know how it works or if further adjustments are needed.

[dmigowski]

Okey, just let me check if I get this thing to compile on my machine, I am just a simple user :).

[skybber]

Hi, I tried to reproduce this issue with the latest version of HA, but I don't see this problem. What JVM are you using please?