How to? More than 2 java processes...

Hi all!
I wonder how I can communicate between 2 or more different java processes running on the same machine?
I know that I can use RMI, CORBA or some plain socket programming. Is there any more ways to do this?
Cheers
Anders =)

Sockets is the lowest level of communication. RMI and CORBA sit on top of sockets. Their is also MPI but I don't actively know of a java MPI implementation. I worked on one 3-4 years ago, but its really probably not necessary with the current options.

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How to more than one scale (4.0 scale and 4.3 scale)

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Jin Dal,
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Hi everyone,
I haven't found any example with infomation about calling a second Java method from C++,after creating a VM from C++ also.
Here is the code I'm testing:
JNIEnv *env;
JavaVM *jvm;
JDK1_1InitArgs vm_args;
jint res;
jclass cls;
jmethodID mid;
jobject jobj;
char classpath[1024];
vm_args.version = 0x00010001;
JNI_GetDefaultJavaVMInitArgs(&vm_args);
sprintf(classpath, "%s%c%s",
vm_args.classpath, PATH_SEPARATOR, USER_CLASSPATH);
vm_args.classpath = classpath;
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fprintf(stderr, "Can't create Java VM\n");
exit(1);
cls = env->FindClass("Consola");
if (cls == 0) {
fprintf(stderr, "Can't find Prog class\n");
exit(2);
mid = env->GetMethodID(cls, "<init>", "()V");
if (mid == 0) {
fprintf(stderr, "Can't find Prog.main\n");
exit(3);
jobj = env->NewObject(cls, mid);
if (jobj == 0) {
fprintf(stderr, "Can't find Prog.main\n");
exit(4);
jmethodID mid2 = env->GetMethodID(cls, "isVisible", "()Z");
if (mid2 == 0) {
fprintf(stderr, "Can't find Prog.main\n");
exit(5);
jboolean b = env->CallBooleanMethod(cls, mid);
All works fine till the last line.
Folowing message appears in screen running the last code line:
Runtime error!
Program: s:\client\mcc_cyg\debg\debug\debgnt.exe
abnormal program termination
What to do ?
Thanks in advance.
Ignasi Villagrasa.

There should be examples of this in the JNI tutorial.
Also suggest a book: essential JNI by Rob Gordon
Briefly, what you need is a reference to the JVM. (I assume you have this - either because it was given to you when your C code started the JVM, or because it was passed as an argument to your native method.)
With the reference, you can look up a class, and look up a method, and call the method.
What about an object reference?
o You can call a method on an object which was passed to your native method.
o You can ask one object for a reference to another object.
o You can call a java constructor, which will return a reference.

I can't call more than 1 Java method from C

Hi friends,
I my program written in C i call two Java methods, but the first method execute correct but the second display a error message:
Unexpected Signal : EXCEPTION_ACCESS_VIOLATION occurred at PC=0x6d475879
Function name=JVM_FindSignal
Library=d:\jdk1.3.1\jre\bin\hotspot\jvm.dll
I inverted the functions, but ever the second function makes a error.
This is my C program:
#include "jni.h"
#include <stdio.h>
#include <windows.h>
#include <stdlib.h>
#include <string.h>
char *getclasspath()
char ambiente[100000];
static char result[200000];
strcpy(ambiente,"-Djava.class.path=");
strcat(ambiente,getenv("CLASSPATH"));
int tam=strlen(ambiente),i,tamresult=0;
for(i=0;i<tam;i++)
if(ambiente!='\\')
result[tamresult++]=ambiente[i];
else
result[tamresult++]='\\';
result[tamresult++]='\\';
result[tamresult]=0;
return result;
char **__stdcall getServerList(int sessionId)
 JavaVM *vm;
 JNIEnv *env;
 JavaVMInitArgs vm_args;
 JavaVMOption options[1];
 options[0].optionString = getclasspath();
 vm_args.version = JNI_VERSION_1_2;
 vm_args.options = options;
 vm_args.nOptions = 1;
 vm_args.ignoreUnrecognized = 1;
 jclass cls;
 jmethodID mid;
 char *retorno;
 int i=0;
 int k=0;
 int j=0;
 char aux[100][100];
 char *lista_server[20];
 char **lista_server_ret;
 /* Invoca a m�quina virtual Java */
 jint res = JNI_CreateJavaVM(&vm, (void **)&env, &vm_args);
 if (res < 0)
 printf("Can't create Java VM\n");
 exit(1);
 /* Procura pela classe */
 cls = (jclass) env->NewGlobalRef(env->FindClass("br.com.cpqd.sagre.security.argus.SagreWebWrapper"));
 if (cls == 0)
 printf("Can't found br.com.cpqd.sagre.security.argus.SagreWebWrapper class\n");
 exit(1);
 /* Procurando o metodo Java getListServerStr */
 if ((mid = env->GetStaticMethodID (cls,"getServerListStr","(I)Ljava/lang/String;")) == 0)
 fprintf (stderr,"Metodo nao encontrado Str\n");
 exit(1);
 jint param = (jint) sessionId;
 /* Executa o m�todo */
 jstring str_java = (jstring) env->CallStaticObjectMethod(cls,mid,param);
 retorno = (char *) env->GetStringUTFChars(str_java,0);
 vm->DestroyJavaVM ();
 int len = strlen(retorno);
 for(i=0;i<len;i++)
 if(retorno[i]!=' ')
 aux[k][j]= retorno[i];
 j++;
 else
 aux[k][j]='\0';
 k++;
 j=0;
 for(i=0;i<k;i++)
 lista_server[i] = aux[i];
 lista_server_ret=(char**)lista_server;
 return lista_server_ret;
char __stdcall encrypt(char clearText)
static JavaVM *vm;
static JNIEnv *env;
JavaVMInitArgs vm_args;
JavaVMOption options[1];
options[0].optionString = getclasspath();
/* "-Djava.class.path=.;.\\SagreUtil.jar";*/
vm_args.version = JNI_VERSION_1_2;
vm_args.options = options;
vm_args.nOptions = 1;
vm_args.ignoreUnrecognized = 1;
jclass cls;
jobject obj;
jmethodID mid;
char *retorno;
/* Invoca a m�quina virtual Java */
jint res = JNI_CreateJavaVM(&vm, (void **)&env, &vm_args);
if (res < 0)
printf("Can't create Java VM\n");
/* Procura pela classe */
cls = env->FindClass("br.com.cpqd.sagre.security.argus.SagreWebWrapper");
if (cls == 0)
printf("Can't find br.com.cpqd.sagre.security.argus.SagreWebWrapper class\n");
/* Procurando o metodo Java encrypt */
if ((mid = env->GetMethodID (cls,"encrypt","(Ljava/lang/String;)Ljava/lang/String;")) == 0)
fprintf (stderr,"Can't find the encrypt method\n");
exit(1);
jstring param = (jstring) env->NewStringUTF (clearText);
/* Instancia o metodo */
obj = env->NewObject(cls,mid,param);
/* Executa o m�todo encrypt */
jstring str_java = (jstring) env->CallObjectMethod(obj,mid,param);
if(str_java!=0)
retorno = (char *) env->GetStringUTFChars(str_java, 0);
else
 vm->DestroyJavaVM ();
 return NULL;
/* Destroi JVM */
vm->DestroyJavaVM ();
return retorno;
int main()
 char **teste;
 char *wilson;
 teste = getServerList(-1);
 printf("Fine %s",teste[1]);
 wilson = encrypt("blablabla");
 printf("%s",wilson);
I appreciate for any reply.
[ ]'s
Bruno

vikram ..
if u r using ms vc++ then there is an option in the directories tab to specify various include files.
if this doesn't work then u can use the command line compiler for vc++ , cl.exe. using cl u can give the -I option and specify the path of whatever file u want to add.
as for the specific file <jni.h> u can find it at :
driveletter:\jdk1.x\include
though i have never used this file as an include statement in .c files that i use for jni.
Dum Spiro Spero

How do more than one expression

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How can more than one online log file be CURRENT?

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         1          1      73393   52428800        512          2 YES INACTIVE            1.2618E+13 09-SEP-13   1.2618E+13 09-SEP-13
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         3          2      64918   52428800        512          2 NO CURRENT             1.2618E+13 09-SEP-13   2.8147E+14
         4          2      64917   52428800        512          2 YES INACTIVE            1.2618E+13 09-SEP-13   1.2618E+13 09-SEP-13
         5          1      73395   52428800        512          2 NO CURRENT             1.2618E+13 09-SEP-13   2.8147E+14
         6          2      64916   52428800        512          2 YES INACTIVE            1.2618E+13 09-SEP-13   1.2618E+13 09-SEP-13
6 rows selected.
I found this in the oracle docs:
"Oracle Database uses only one redo log files at a time to store redo records written from the redo log buffer. The redo log file that LGWR is actively writing to is called the current redo log file."

this is where it confuses me actually. I also thought about 2 nodes writing to 2 online log. But when I was querying gv$log, I saw 4 CURRENT entries.
SQL> select * from gv$log;
   INST_ID     GROUP#    THREAD# SEQUENCE#      BYTES BLOCKSIZE    MEMBERS ARC STATUS           FIRST_CHANGE# FIRST_TIM NEXT_CHANGE# NEXT_TIME
         2          1          1      73393   52428800        512          2 YES INACTIVE            1.2618E+13 09-SEP-13   1.2618E+13 09-SEP-13
         2          2          1      73394   52428800        512          2 YES INACTIVE            1.2618E+13 09-SEP-13   1.2618E+13 09-SEP-13
         2          3          2      64918   52428800        512          2 NO CURRENT             1.2618E+13 09-SEP-13   2.8147E+14
         2          4          2      64917   52428800        512          2 YES INACTIVE            1.2618E+13 09-SEP-13   1.2618E+13 09-SEP-13
         2          5          1      73395   52428800        512          2 NO CURRENT             1.2618E+13 09-SEP-13   2.8147E+14
         2          6          2      64916   52428800        512          2 YES INACTIVE            1.2618E+13 09-SEP-13   1.2618E+13 09-SEP-13
         1          1          1      73393   52428800        512          2 YES INACTIVE            1.2618E+13 09-SEP-13   1.2618E+13 09-SEP-13
         1          2          1      73394   52428800        512          2 YES INACTIVE            1.2618E+13 09-SEP-13   1.2618E+13 09-SEP-13
         1          3          2      64918   52428800        512          2 NO CURRENT             1.2618E+13 09-SEP-13   2.8147E+14
         1          4          2      64917   52428800        512          2 YES INACTIVE            1.2618E+13 09-SEP-13   1.2618E+13 09-SEP-13
         1          5          1      73395   52428800        512          2 NO CURRENT             1.2618E+13 09-SEP-13   2.8147E+14
         1          6          2      64916   52428800        512          2 YES INACTIVE            1.2618E+13 09-SEP-13   1.2618E+13 09-SEP-13
12 rows selected.
SQL>
Maybe the thread# is the key? What does thread# mean here. Oracle doc of thread# doesn't describe much:   -> V$LOG

How about more than 12 months?

There is a lot of great technical information in this forum--I refer to it frequently. Only migrating one year of it is not enough, I think. Why can't all of it be migrated?
Cheers!
-- Jim

>As Jacob points out, most of the forums only contain data going back about 12 months or so.
>But I have raised the point and we are going to look at bringing over everything from this current forum.
That may still end up being 12 months.
>Many of the oldies that are preserved were preserved for a specific reason back then (a few years ago)
that not longer exists, but there hasn't been an effective way to go back to them
to let them expire.
But this really begs the question. Why do posts expire so quickly. Most of the stuff discussed is still relevant even years later. This is especially true on the scripting forums.
I don't really buy the search argument. There should be an option to limit the search to specific time periods. That way the user can decide whether old posts are "pollution" or not.
Please don't let threads expire on the new forums!!! (at least not for at least ten years or so...)

How to? More than 2 java processes...

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