ridljar: check that UnoClassLoader is used for NativeLibraryLoader

The native libraries are local to class loaders, so
System.load("java_uno.so") will fail with any other class loader.

Change-Id: Ifa3b1b8dfef07b64828943654e28ff1f0fb5a494
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/120527
Tested-by: Jenkins
Reviewed-by: Michael Stahl <michael.stahl@allotropia.de>

1 files changed, 9 insertions, 0 deletions

diff --git a/ridljar/com/sun/star/lib/util/NativeLibraryLoader.java b/ridljar/com/sun/star/lib/util/NativeLibraryLoader.java
index eb5c6af34e90..d255a71ea5d1 100644
--- a/ridljar/com/sun/star/lib/util/NativeLibraryLoader.java
+++ b/ridljar/com/sun/star/lib/util/NativeLibraryLoader.java
@@ -21,6 +21,7 @@ package com.sun.star.lib.util;
 import java.io.File;
 import java.net.URL;
 import java.net.URLClassLoader;
+import com.sun.star.lib.unoloader.UnoClassLoader;
 
 /**
  * Helper functions to locate and load native files.
@@ -35,6 +36,14 @@ import java.net.URLClassLoader;
  * algorithm.</p>
  */
 public final class NativeLibraryLoader {
+    static {
+        // if it's some other class loader, then resolving the symbol
+        // Java_com_sun_star_bridges_jni_1uno_JNI_1proxy_dispatch_1call in
+        // java_uno will not work and result in UnsatisfiedLinkError
+        if (!(NativeLibraryLoader.class.getClassLoader() instanceof com.sun.star.lib.unoloader.UnoClassLoader)) {
+            System.err.println("warning: com.sun.star.lib.util.NativeLibraryLoader must be loaded by com.sun.star.lib.unoloader.UnoClassLoader for java_uno bridge to work (not a problem if this is using Java remote bridge or unit test)");
+        }
+    }
     /**
      * Load a system library, using a given class loader to locate the library.
      *