[ https://jira.qos.ch/browse/SLF4J-438?page=com.atlassian.jira.plugin.system.i... ] Andreas Bergander commented on SLF4J-438: ----------------------------------------- I noticed that there are some fixes for this issue in the 1.8.0 branch but I still get this error: {noformat} java.lang.IllegalAccessException: class org.apache.log4j.MDCFriend cannot access a member of class org.apache.log4j.MDC with modifiers "static final" at java.base/jdk.internal.reflect.Reflection.newIllegalAccessException(Reflection.java:360) at java.base/java.lang.reflect.AccessibleObject.checkAccess(AccessibleObject.java:589) at java.base/java.lang.reflect.Field.checkAccess(Field.java:1075) at java.base/java.lang.reflect.Field.get(Field.java:416) at org.apache.log4j.MDCFriend.fixForJava9(MDCFriend.java:15) at org.slf4j.log4j12.Log4jMDCAdapter.<clinit>(Log4jMDCAdapter.java:38) at org.slf4j.impl.StaticMDCBinder.getMDCA(StaticMDCBinder.java:60) at org.slf4j.MDC.bwCompatibleGetMDCAdapterFromBinder(MDC.java:99) at org.slf4j.MDC.<clinit>(MDC.java:108) {noformat}  

IllegalAccessError in MDC when using Java 10 --------------------------------------------

Key: SLF4J-438 URL: https://jira.qos.ch/browse/SLF4J-438 Project: SLF4J Issue Type: Bug Affects Versions: 1.7.25, 1.8.0-beta2 Environment: Java 10 slf4j-api-1.7.25 slf4j-log4j12-1.7.25 Reporter: Andreas Bergander Assignee: SLF4J developers list

When using MDC and log4j I get an IllegalAccessError during initialization. {noformat} java.lang.IllegalAccessError: tried to access field org.apache.log4j.MDC.mdc from class org.apache.log4j.MDCFriend         at org.apache.log4j.MDCFriend.fixForJava9(MDCFriend.java:11)         at org.slf4j.impl.Log4jMDCAdapter.<clinit>(Log4jMDCAdapter.java:38)         at org.slf4j.impl.StaticMDCBinder.getMDCA(StaticMDCBinder.java:59)         at org.slf4j.MDC.bwCompatibleGetMDCAdapterFromBinder(MDC.java:99)         at org.slf4j.MDC.<clinit>(MDC.java:108) {noformat}  I guess package private fields are not accessible between different jar-files anymore in Java 10. Or am I doing something wrong?  

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