[jira] [Created] (CAMEL-16943) MainPropertyPlaceholderWithEnvTest failed with JDK17

["Freeman Yue Fang (Jira)" <ji...@apache.org>]

Freeman Yue Fang created CAMEL-16943:
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             Summary: MainPropertyPlaceholderWithEnvTest failed with JDK17
                 Key: CAMEL-16943
                 URL: https://issues.apache.org/jira/browse/CAMEL-16943
             Project: Camel
          Issue Type: Test
          Components: camel-main
            Reporter: Freeman Yue Fang


get exception like
{code}
Suppressed: java.lang.reflect.InaccessibleObjectException: Unable to make field private final java.util.Map java.util.Collections$UnmodifiableMap.m accessible: module java.base does not "opens java.util" to unnamed module @bf20622
		at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:354)
		at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297)
		at java.base/java.lang.reflect.Field.checkCanSetAccessible(Field.java:178)
		at java.base/java.lang.reflect.Field.setAccessible(Field.java:172)
		at org.apache.camel.main.MainPropertyPlaceholderWithEnvTest.getFieldValue(MainPropertyPlaceholderWithEnvTest.java:276)
		at org.apache.camel.main.MainPropertyPlaceholderWithEnvTest.getEditableMapOfVariables(MainPropertyPlaceholderWithEnvTest.java:226)
		at org.apache.camel.main.MainPropertyPlaceholderWithEnvTest.doEnvVariable(MainPropertyPlaceholderWithEnvTest.java:206)
		at org.apache.camel.main.MainPropertyPlaceholderWithEnvTest.tearDown(MainPropertyPlaceholderWithEnvTest.java:182)
		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)

{code}

This is because System.getEnv() returns a java.util.Collections$UnmodifiableMap which isn't supposed to be changed during runtime code. To workaround this, normally we need to use reflection way to make a private field in java.util.Collections$UnmodifiableMap accessible.

But this is kind of against the encapsulation(Strongly Encapsulate JDK Internals ) rule of java Modules since JDK9. Before JDK17,  it is it  possible to access internal APIs via the --illegal-access command line option which is enabled by default. However, since JDK17 this --illegal-access is removed and we need to either explicitly use --add-opens modules to enable deep reflection for JDK internal code, or we need to get rid of the way to use JDK Internals



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