Invoking a Database boolean Function from Java

Hi,
I have the following boolean database function --
FUNCTION isPositive(p_count NUMBER) RETURN BOOLEAN
IS
BEGIN
    IF p_count < 0 THEN
      return false;
    END IF;
    return true;
END;I read somewhere that CallableStatement doesn't support the boolean function.
I tried to use CallableStatement to invoke the above function as follows --
    String sql = "begin ? := helperpkg.isPositive(?); end;";
    CallableStatement cs = jdbcConn.prepareCall(sql);
    cs.registerOutParameter(1, java.sql.Types.BOOLEAN);
    cs.setInt(2, -5);
    cs.execute();
    return cs.getBoolean(1);But it gave me the exception --
java.sql.SQLException: Invalid column type
        at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:134)
        at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:179)
        at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:269)
        at oracle.jdbc.driver.OracleStatement.get_internal_type(OracleStatement.java:6164)
        at oracle.jdbc.driver.OracleCallableStatement.registerOutParameterBytes(OracleCallableStatement.java:244)
        at oracle.jdbc.driver.OracleCallableStatement.registerOutParameter(OracleCallableStatement.java:393)
        at oracle.jdbc.driver.OracleCallableStatement.registerOutParameter(OracleCallableStatement.java:462)
        at DBConnector.invokeFunction(DBConnector.java:63)
        at DBConnector.main(DBConnector.java:21)Please advice.
Thanks

I read somewhere that CallableStatement doesn't
support the boolean function.http://download.oracle.com/docs/cd/B19306_01/java.102/b14355/apxref.htm#BABFECBJ
Best regards
Maxim

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Calling a SP or Function from Java receiving a geometry(MDSYS.SDO_GEOMETRY)

Hi there,
What I want to do is: calling a stored procedure OR function from Java with a String-variable as input and receiving a geometry (SDO_GEOMETRY).
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Call: BEGIN ? := GET_GEO_BRD_FUNCTION(p_geo_brd_id=>?); END;
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Query: ValueReadQuery()
So I thought may be let's try it with a stored procedure instead...
The procedure looks like this:
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@Override
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java.sql.SQLException: ORA-06550: Row 1, Column 13:
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ORA-06550: Row 1, Column 7:
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So both exceptions look quite similar.
I guess in both cases the exception description leads to the assumption, that the wrong type for the return value / output parameter is used…
So - how can a receive a MDSYS_SDO_GEOMETRY object from a stored procedure or stored function in Java ?
What is wrong in the Java code?
Thank you in advance for any suggestions!
Yours,
Chris
Edited by: user3938161 on 20.12.2011 07:46
Edited by: user3938161 on Dec 20, 2011 8:06 AM: added variable declaration of JGeometry geometry in source code

Thanks, that did the trick! ;-)
Here is now the code for stored procedure and function for anybody else encountering the same troubles... (be aware of the parameter order and/or naming!)
Code for stored functions:
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The code for stored procedure solution:
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          return false;
     if(!GetStringFromRegistry(subkey, "JavaHome", (unsigned char *)buf, bufsize)){
          //LogError("Failed reading value of registry key:\n\t"JRE_KEY "\\%s\\JavaHome\n", version);
          RegCloseKey(key);
          RegCloseKey(subkey);
          return false;
     RegCloseKey(key);
     RegCloseKey(subkey);
     return true;
//Native interface call to printf
jint JNICALL _vfprintf_(FILE *fp, const char *format, va_list args){
     //LogError(format,args);
     return 0;
//Native interface call if the VM exited
void JNICALL _exit_(jint code){
     //LogError("VM exited");
     exit(code);
//Native interface call if the VM aborted
void JNICALL _abort_(void){
     //LogError("VM aborted");
     abort();
//Load the Java Virtual Machine
void InvokeJVM::LoadJVM(char* dir){
     HINSTANCE handle;
     JavaVMOption options[5];
     char JREHome[MAX_PATH];
     char JVMPath[MAX_PATH];
     char classpathOption[MAX_PATH];
     char librarypathOption[MAX_PATH];
     if(!GetPublicJREHome(JREHome, MAX_PATH)){
          //LogError("Could not locate JRE");
          abort();
     strcpy(JVMPath,JREHome);
     strcat(JVMPath,"\\jre\\bin\\client\\jvm.dll");
     if ((handle=LoadLibrary(JVMPath))==0) {
          //LogError("Error loading: %s", JVMPath);
          abort();
     CreateJavaVM_t pfnCreateJavaVM=(CreateJavaVM_t)GetProcAddress(handle,"JNI_CreateJavaVM");
     if (pfnCreateJavaVM==0){
          //LogError("Error: can't find JNI interfaces in: %s",JVMPath);
          abort();
     strcpy(classpathOption,"-Djava.class.path=");
     strcat(classpathOption,dir);
     strcat(classpathOption,";");
     strcat(classpathOption,JREHome);
     strcat(classpathOption,"\\lib");
     strcat(classpathOption,";");
     strcat(classpathOption,JREHome);
     strcat(classpathOption,"\\lib\\comm.jar");
     strcpy(librarypathOption,"-Djava.library.path=");
     strcat(librarypathOption,JREHome);
     strcat(librarypathOption,"\\lib");
     OutputDebugString("classpath option=");
     OutputDebugString(classpathOption);
     OutputDebugString("\n");
     OutputDebugString("librarypath option=");
     OutputDebugString(librarypathOption);
     OutputDebugString("\n");
     options[0].optionString=classpathOption;
     options[1].optionString=librarypathOption;
     options[2].optionString="vfprintf";
     options[2].extraInfo=_vfprintf_;
     options[3].optionString="exit";
     options[3].extraInfo=_exit_;
     options[4].optionString="abort";
     options[4].extraInfo=_abort_;
     vmArgs.version = JNI_VERSION_1_2;
     vmArgs.nOptions = 5;
     vmArgs.options = options;
     vmArgs.ignoreUnrecognized = false;
     if(pfnCreateJavaVM(&jvm,(void**)&env, &vmArgs) != 0){
          //LogError("Could not create VM");
          abort();
}Winmain.cpp:
#define WIN32_MEAN_AND_LEAN
#define WIN32_EXTRA_LEAN
#include <windows.h>
#include "oglwindow.h"          // the OpenGL window class
#include "vector.h"
#include "engine.h"               // the engine's main class
#include "BrimstoneEngine.h"
#include "InvokeJVM.h"
JNIEXPORT void JNICALL Java_HelloWorld_displayHelloWorld(JNIEnv *, jobject){
    MessageBox(NULL, "Hello From Java!", "Error", MB_OK);
    return;
JNIEXPORT void JNICALL Java_Callbacks_nativeMethod(JNIEnv *env, jobject obj, jint depth){
jclass cls = env->GetObjectClass(obj);
jmethodID mid = env->GetMethodID(cls, "callback", "(I)V");
if (mid == 0) {
    return;
printf("In C, depth = %d, about to enter Java\n", depth);
env->CallVoidMethod(obj, mid, depth);
printf("In C, depth = %d, back from Java\n", depth);
JNINativeMethod methods[] = {"nativeMethod","()V", Java_Callbacks_nativeMethod};
WINAPI WinMain(HINSTANCE hInst, HINSTANCE, LPSTR, int nCmdShow){
     InvokeJVM javaVirtualMachine;
     int loopRet;
     javaVirtualMachine.running = false;
     CoInitialize(NULL);
     if (!COGLWindow::RegisterWindow(hInst)){
          MessageBox(NULL, "Failed to register window class", "Error", MB_OK);
          return -1;
     BrimstoneEngine *engine = NULL;
     try{
          char path[MAX_PATH];
          char drive[MAX_PATH];
          char file[MAX_PATH];
          char dir[MAX_PATH];
          char ext[MAX_PATH];
          jclass cls, cls1;
          jmethodID mid;
          jobjectArray args;
          jint err;
          _splitpath(path,drive,dir,file,ext);
          javaVirtualMachine.LoadJVM(dir);
          if(javaVirtualMachine.env == NULL){
               MessageBox(NULL, "Could not load VM", "Error", MB_OK);
               abort();
          if(GetModuleFileName(NULL, path, MAX_PATH) == 0){
               javaVirtualMachine.LogWin32Error("Getting module filename");
               abort();
          cls = javaVirtualMachine.env->FindClass("Callbacks");
          if(cls == NULL){
               MessageBox(NULL, "Could not find class %s (or its superclass)", "Error", MB_OK);
               exit(-1);
          err = javaVirtualMachine.env->RegisterNatives(cls, methods, 1 );
          mid = javaVirtualMachine.env->GetMethodID(cls, "main", "([Ljava/lang/String;)V");
          if(mid == NULL){
               MessageBox(NULL, "Could not find method 'main'", "Error", MB_OK);
               exit(-1);
          args = javaVirtualMachine.env->NewObjectArray(2-2, javaVirtualMachine.env->FindClass("java/lang/String"), NULL);
          if(args==NULL){
               MessageBox(NULL, "Could not create args array", "Error", MB_OK);
          for(int arg=0; arg < 2;arg++)     {
               javaVirtualMachine.env->SetObjectArrayElement(args, arg, javaVirtualMachine.env->NewStringUTF(argv[arg+2]));
          javaVirtualMachine.env->CallStaticVoidMethod(cls,mid,args);
          javaVirtualMachine.jvm->DestroyJavaVM();
          engine = new BrimstoneEngine("OpenGL Game", FALSE, 800, 600, 16);
          loopRet = engine->EnterMessageLoop();
          delete engine;
          return loopRet;
     catch(char *sz)
          MessageBox(NULL, sz, 0, 0);
          delete engine;
     CoUninitialize();
     return -1;
}any help is always appreciated

Calling a javascript function from java code and getting tha value in Java

Hi,
I would like to call a Java script function confirmRemove() from Java code upon meeting a condition..
for example the code snippet is:
if(true){
// I want to call js confirmRemove() over here. And get the value of variable "answer" in this if block.
<html>
<head>
<script type="text/javascript">
function confirmRemove() {
var answer = confirm("Are you sure you want to Delete?")
</script>
</head>
<body>
<form>...

Hi,
Back in 2003 I have used an Applet which contain java code and this java code was calling the java scripts ( different methods, DHTML etc..)
There was a component developed by NetScape called JSObject I am not sure it there is other third party component other then the JSObject
look at this article which shows how (based on JSObject)
[http://java.sun.com/products/plugin/1.3/docs/jsobject.html|http://java.sun.com/products/plugin/1.3/docs/jsobject.html]
Regards,
Alan Meio
London,UK

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