Java method call from c passing string more info

Question

I am trying to call a java method from c passing a String as an argument.
my C code is as follows.
//Initalise jstring and class (to recieve String)
jstring textp;
jclass texts = (*env)->GetObjectClass(env, obj);
jmethodID text = (*env)->GetMethodID(env, texts, "texture", "([Ljava/lang/String;)V");
//Create a new jstring from the char* texturePath (in textures)
//call the java method with the jstring
textp = (*env)->NewStringUTF(env,ret.textures->texturePath);
(*env)->CallVoidMethod(env, obj, text,textp);
//java code
// texture which recieves a string
public void texture(String texturePath){
The error I get is as follows:
SIGSEGV 11 segmentation violation
si_signo [11]: SEGV
si_errno [0]:
si_code [1]: SEGV_MAPERR [addr: 0xc]
stackpointer=FFBED790
"Screen Updater" (TID:0x4f9060, sys_thread_t:0x4f8f98, state:CW, thread_t: t@11, threadID:0xf2d31d78, stack_bottom:0xf2d32000, stack_size:0x20000) prio=4
[1] java.lang.Object.wait(Object.java:424)
[2] sun.awt.ScreenUpdater.nextEntry(ScreenUpdater.java:78)
[3] sun.awt.ScreenUpdater.run(ScreenUpdater.java:98)
"AWT-Motif" (TID:0x40be50, sys_thread_t:0x40bd88, state:R, thread_t: t@10, threadID:0xf2d71d78, stack_bottom:0xf2d72000, stack_size:0x20000) prio=5
[1] sun.awt.motif.MToolkit.run(Native Method)
[2] java.lang.Thread.run(Thread.java:479)
"SunToolkit.PostEventQueue-0" (TID:0x431950, sys_thread_t:0x431888, state:CW, thread_t: t@9, threadID:0xf2e71d78, stack_bottom:0xf2e72000, stack_size:0x20000) prio=5
[1] java.lang.Object.wait(Object.java:424)
[2] sun.awt.PostEventQueue.run(SunToolkit.java:407)
"AWT-EventQueue-0" (TID:0x430ea8, sys_thread_t:0x430de0, state:CW, thread_t: t@8, threadID:0xf3071d78, stack_bottom:0xf3072000, stack_size:0x20000) prio=6
[1] java.lang.Object.wait(Object.java:424)
[2] java.awt.EventQueue.getNextEvent(EventQueue.java:212)
[3] java.awt.EventDispatchThread.pumpOneEvent(EventDispatchThread.java:100)
[4] java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:91)
[5] java.awt.EventDispatchThread.run(EventDispatchThread.java:83)
Exiting Thread (sys_thread_t:0xff343db0) : no stack
"Finalizer" (TID:0x154e98, sys_thread_t:0x154dd0, state:CW, thread_t: t@6, threadID:0xfe391d78, stack_bottom:0xfe392000, stack_size:0x20000) prio=8
[1] java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:146)
[2] java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:168)
[3] java.lang.ref.Finalizer$FinalizerWorker$FinalizerThread.run(Finalizer.java:124)
"Reference Handler" (TID:0x1506a0, sys_thread_t:0x1505d8, state:CW, thread_t: t@5, threadID:0xfe3c1d78, stack_bottom:0xfe3c2000, stack_size:0x20000) prio=10
[1] java.lang.Object.wait(Object.java:424)
[2] java.lang.ref.Reference$ReferenceHandler.run(Reference.java:130)
"Signal dispatcher" (TID:0x13d180, sys_thread_t:0x13d0b8, state:MW, thread_t: t@4, threadID:0xfe3f1d78, stack_bottom:0xfe3f2000, stack_size:0x20000) prio=10
"main" (TID:0x38918, sys_thread_t:0x38850, state:R, thread_t: t@1, threadID:0x25228, stack_bottom:0xffbf0000, stack_size:0x800000) prio=5 *current thread*
[1] loader.Callbacks.nativeMethod(Native Method)
[2] loader.Callbacks.main(Callbacks.java:184)
[3] graphics.GR_MakeTrack.init(GR_MakeTrack.java:60)
[4] graphics.GR_MakeTrack.main2(GR_MakeTrack.java:49)
[5] graphics.GR_MakeTrack.main(GR_MakeTrack.java:41)
[6] control.GE_main.GE_main1(GE_main.java:87)
[7] control.GE_main.main(GE_main.java:66)
gmake: *** [run] Abort (core dumped)

Answer 1

I am trying to call a java method from c passing a
String as an argument.
my C code is as follows.
//Initalise jstring and class (to recieve String)
jstring textp;
jclass texts = (*env)->GetObjectClass(env, obj);
jmethodID text = (*env)->GetMethodID(env, texts,
"texture", "([Ljava/lang/String;)V");
Hi Pete,
your problem is that the method texture you are trying to find does not exist. If you look carefully at your declaration of the method signature in the GetMethodID call you will see "([Ljava/lang/String;)V" which is trying to find a method that accepts a String array as its parameter. Remove the [ from the method signature and it should work ok. You might want to test text (jmethodID) for NULL or 0 before trying to call it as well.