JDK 24 remove java.security.AccessController.doPrivileged part 2

[theresa-m]

This pull requests is the second of two prs to remove the use of java.security.AccessController.doPrivileged in JDK 24. It also removes a few cases of System.getSystemProperty and SecurityException mentions that were previously missed.

Related #20563

@keithc-ca @JasonFengJ9 this is the last of the SecurityManager removal JCL changes for Java 24 that I've found, please let me know if there's any you know of that I've missed.

[JasonFengJ9]

Please remove the following from JDK24+

openj9/jcl/src/java.management/share/classes/com/ibm/java/lang/management/internal/ThreadMXBeanImpl.java

Line 875 in 6ea0111

* @note this must be wrapped in a doPrivileged().

openj9/jcl/src/java.base/share/classes/java/lang/Class.java

Line 5658 in 64a7502

* @throws SecurityException if a SecurityManager is present and package access is not allowed

openj9/jcl/src/java.base/share/classes/java/lang/System.java

Line 903 in 64a7502

* @throws SecurityException if the running thread is not allowed to cause the vm to exit.

Can JDK24+ System.initSecurityManager() be simplified to

openj9/jcl/src/java.base/share/classes/java/lang/System.java

Lines 1387 to 1388 in 64a7502

	/*[MSG "K0B04", "A command line option has attempted to allow or enable the Security Manager. Enabling a Security Manager is not supported."]*/
	throw new Error(Msg.getString("K0B04")); //$NON-NLS-1$

without throwErrorOnInit?

[theresa-m]

Can JDK24+ System.initSecurityManager() be simplified to

openj9/jcl/src/java.base/share/classes/java/lang/System.java

Lines 1387 to 1388 in 64a7502

	/*[MSG "K0B04", "A command line option has attempted to allow or enable the Security Manager. Enabling a Security Manager is not supported."]*/
	throw new Error(Msg.getString("K0B04")); //$NON-NLS-1$

without throwErrorOnInit?

This method should not throw an error when java.security.manager is empty or set to "disallow".

[keithc-ca]

Jenkins test sanity amac jdk21,jdk24