Comments on: Adding new paths for native libraries at runtime in Java https://blog.sibvisions.com/2020/05/22/adding-new-paths-for-native-libraries-at-runtime-in-java/ Blog @ SIB Visions Wed, 05 Mar 2025 13:10:49 +0100 hourly 1 By: rjahn https://blog.sibvisions.com/2020/05/22/adding-new-paths-for-native-libraries-at-runtime-in-java/comment-page-1/#comment-751 rjahn Mon, 09 Sep 2024 12:17:32 +0000 https://blog.sibvisions.com/?p=8354#comment-751 Check: https://blog.sibvisions.com/2024/09/09/adding-new-paths-for-native-libraries-at-runtime-in-java-part-2/ Check: https://blog.sibvisions.com/2024/09/09/adding-new-paths-for-native-libraries-at-runtime-in-java-part-2/

]]> By: rjahn https://blog.sibvisions.com/2020/05/22/adding-new-paths-for-native-libraries-at-runtime-in-java/comment-page-1/#comment-732 rjahn Mon, 04 Jan 2021 12:56:36 +0000 https://blog.sibvisions.com/?p=8354#comment-732 Not really! It works up to Java 14 in our tests. The problem is that they changed the internal handling of sys path... and it was their intention to prevent this "hack". We'll try to find a solution but right now, it won't work with Java > 15. Not really! It works up to Java 14 in our tests.

The problem is that they changed the internal handling of sys path... and it was their intention to prevent this "hack".
We'll try to find a solution but right now, it won't work with Java > 15.

]]> By: Kris Kristensen https://blog.sibvisions.com/2020/05/22/adding-new-paths-for-native-libraries-at-runtime-in-java/comment-page-1/#comment-731 Kris Kristensen Mon, 04 Jan 2021 12:52:22 +0000 https://blog.sibvisions.com/?p=8354#comment-731 any luck so far...? any luck so far...?

]]> By: rjahn https://blog.sibvisions.com/2020/05/22/adding-new-paths-for-native-libraries-at-runtime-in-java/comment-page-1/#comment-730 rjahn Sat, 19 Dec 2020 13:25:59 +0000 https://blog.sibvisions.com/?p=8354#comment-730 Bad news, but maybe only because the class structure has changed.... I'll check both problems tomorrow.... Hopefully there's a possibility to enable this again. Bad news, but maybe only because the class structure has changed.... I'll check both problems tomorrow.... Hopefully there's a possibility to enable this again.

]]> By: Kris Kristensen https://blog.sibvisions.com/2020/05/22/adding-new-paths-for-native-libraries-at-runtime-in-java/comment-page-1/#comment-729 Kris Kristensen Sat, 19 Dec 2020 11:06:58 +0000 https://blog.sibvisions.com/?p=8354#comment-729 With JDK 15.01 it becomes even worse. Now usr_paths are reflected as not even being part of the ClassLoader class: java.lang.reflect.InvocationTargetException at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:564) at com.foo.bar.(NativeLoader.java:48) Caused by: java.lang.NoSuchFieldException: no such field: java.lang.ClassLoader.usr_paths/[Ljava.lang.String;/getStatic at java.base/java.lang.invoke.MemberName.makeAccessException(MemberName.java:980) at java.base/java.lang.invoke.MemberName$Factory.resolveOrFail(MemberName.java:1117) at java.base/java.lang.invoke.MethodHandles$Lookup.resolveOrFail(MethodHandles.java:3424) at java.base/java.lang.invoke.MethodHandles$Lookup.findStaticVarHandle(MethodHandles.java:3024) ... 5 more Caused by: java.lang.NoSuchFieldError: usr_paths at java.base/java.lang.invoke.MethodHandleNatives.resolve(Native Method) at java.base/java.lang.invoke.MemberName$Factory.resolve(MemberName.java:1087) at java.base/java.lang.invoke.MemberName$Factory.resolveOrFail(MemberName.java:1114) ... 7 more With JDK 15.01 it becomes even worse. Now usr_paths are reflected as not even being part of the ClassLoader class:

java.lang.reflect.InvocationTargetException
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at com.foo.bar.(NativeLoader.java:48)
Caused by: java.lang.NoSuchFieldException: no such field: java.lang.ClassLoader.usr_paths/[Ljava.lang.String;/getStatic
at java.base/java.lang.invoke.MemberName.makeAccessException(MemberName.java:980)
at java.base/java.lang.invoke.MemberName$Factory.resolveOrFail(MemberName.java:1117)
at java.base/java.lang.invoke.MethodHandles$Lookup.resolveOrFail(MethodHandles.java:3424)
at java.base/java.lang.invoke.MethodHandles$Lookup.findStaticVarHandle(MethodHandles.java:3024)
... 5 more
Caused by: java.lang.NoSuchFieldError: usr_paths
at java.base/java.lang.invoke.MethodHandleNatives.resolve(Native Method)
at java.base/java.lang.invoke.MemberName$Factory.resolve(MemberName.java:1087)
at java.base/java.lang.invoke.MemberName$Factory.resolveOrFail(MemberName.java:1114)
... 7 more

]]> By: Kris Kristensen https://blog.sibvisions.com/2020/05/22/adding-new-paths-for-native-libraries-at-runtime-in-java/comment-page-1/#comment-728 Kris Kristensen Sat, 19 Dec 2020 08:33:21 +0000 https://blog.sibvisions.com/?p=8354#comment-728 Hi, This is just brillant, thanks a tonn! - however there is a little curveball to this. It won't wotk with java 13 unfortunately. Check my stacktrace below. If you could make it java 13 compliant, that would be highly appreciated. Thanks again. Stacktrace from java 13 (openjdk): WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access using Lookup on com.foo.bar.NativeLoader (file:/classes/) to class java.lang.ClassLoader WARNING: Please consider reporting this to the maintainers of com.foo.bar.NativeLoader WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Exception in thread "main" java.lang.ExceptionInInitializerError Caused by: java.lang.NullPointerException The NPE is the saPath from your example being null. I guess it would be oodd for usr_paths to be null, so I guess reflection filetered it away. Hi,

This is just brillant, thanks a tonn! - however there is a little curveball to this. It won't wotk with java 13 unfortunately. Check my stacktrace below.

If you could make it java 13 compliant, that would be highly appreciated. Thanks again.

Stacktrace from java 13 (openjdk):
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access using Lookup on com.foo.bar.NativeLoader (file:/classes/) to class java.lang.ClassLoader
WARNING: Please consider reporting this to the maintainers of com.foo.bar.NativeLoader
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
Exception in thread "main" java.lang.ExceptionInInitializerError
Caused by: java.lang.NullPointerException

The NPE is the saPath from your example being null. I guess it would be oodd for usr_paths to be null, so I guess reflection filetered it away.

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