Yeah OK. SETEC ASTRONOMY. ________________________________ From: David Holmes <david.hol...@oracle.com> Sent: Friday, August 3, 2018 9:03 AM To: mr rupplin; build-dev@openjdk.java.net Subject: Re: JNI Native - System (java.lang.System)
On 3/08/2018 10:49 PM, mr rupplin wrote: > How would I subscribe to core-libs-dev? The same way you subscribed to build-dev. ??? http://mail.openjdk.java.net/mailman/listinfo/core-libs-dev David > Ok. > ------------------------------------------------------------------------ > *From:* David Holmes <david.hol...@oracle.com> > *Sent:* Thursday, August 2, 2018 11:55 PM > *To:* mr rupplin; build-dev@openjdk.java.net > *Subject:* Re: JNI Native - System (java.lang.System) > Hi Max, > > The build-dev list is for discussing the OpenJDK build system. You > appear to running into issues customizing parts of OpenJDK for your own > use. It would be more appropriate to ask on core-libs-dev how to extend > the System class - though examination of the existing native methods in > System.java and System.c should show how it is done. There is not enough > information in your post to see where you may have a made an error or > omission. > > Cheers, > David > > On 3/08/2018 12:53 PM, mr rupplin wrote: >> Hello. >> >> Trying to run a simple JNI call and I keep getting the following: >> >> SecureJVM : GNU Public License 2.0 >> Program Name >> java >> Launcher Name >> openjdk >> Windows >> off >> Version >> 9-internal+0-adhoc.mearvk.jdk9 >> >> A new instance of Hope is born. >> Exception in thread "main" java.lang.UnsatisfiedLinkError: >> java.lang.System.setMemoryAllocationListener0(Ljava/lang/memory/MemoryAllocationListener;)V >> at java.base/java.lang.System.setMemoryAllocationListener0(Native Method) >> at java.base/java.lang.System.setMemoryAllocationListener(System.java:261) >> at Hope.<init>(Hope.java:19) >> >> >> The source looks like: >> >> public static void setMemoryAllocationListener(MemoryAllocationListener >> memoryAllocationListener) { >> checkMalloc(); >> setMemoryAllocationListener0(memoryAllocationListener); >> } >> >> >> The C source looks like: >> >> >> JNIEXPORT void JNICALL >> Java_java_lang_System_setMemoryAllocationListener0(JNIEnv *env, jclass cla, >> jobject listener) >> { >> printf("setMemoryAllocationListener called:\n"); >> >> jfieldID fid = >> >> (*env)->GetStaticFieldID(env,cla,"memoryAllocationListener","Ljava/lang/memory/MemoryAllocationListener;"); >> >> printf("\t >> Lookup of MemoryAllocationListener completed"); >> >> if (fid == 0) >> return; >> >> >> (*env)->SetStaticObjectField(env,cla,fid,listener); >> >> printf("\t >> SetStaticObjectField completed"); >> } >> >> >> I am unable to discern the problem. The make runs clean as does a >> non-native call that instantiates a MemoryAllocationListener object. >> >> Can you guys spot the issue? >> >> Thanks, >> >> Max R. >> >> Sr. Software Tech >>
