How do I increase the JVM heap size

How do I increase the Java heap space
i've used java -Xms32m -Xmx256m
but it just keeps outputing the usage: java [-opetions] class [args...]
-client
-server
-hotspot
-cp
-classpath

htats wrote:
How do I increase the Java heap space
i've used java -Xms32m -Xmx256m
but it just keeps outputing the usage: java [-options] class [args...]Did you give it a class to run?

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How to increase the Java Heap size ?

Hi
I am new to java. I have created a java application and i configured in Eclipse. While running my application it throws an error that
"Exception in thread "Thread-21" java.lang.OutOfMemoryError: Java heap space"
i have used threads in my application. Then i searched some forums regarding this. The answer i got is "Increase the java heap size" using
"java -Xms64m -Xmx256m prog" in command prompt. while running.
But i am not running my application in command prompt. I used Eclipse to run my application. Here my ultimate question is how to set the heap size while running the application in Eclipse and where to set in Eclipse.
Kindly help me.
Regards
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How to increase JVM Heap Size

Hi all,
Our Environment
===============
OS - Windows XP Service Pack 3
Oracle Developer Suite - 10.1.2.3.0
Oracle Forms & Reports Service 10.1.2.3.0
Oracle Database 10.2.0.1.0
JDK 1.5
Jinitiator 1.3.1.30
Apache POI 3.5
From forms we are writing to excel files after copying XL template using Apache POI 3.5 and JDK 1.5. This XL template file has got lot of macros.
We have imported the Java class files into form as pl/sql library. We are able to write upto 7Mb size of XL file. Beyond that size it comes with the error Ora-105101.
We tried to increase the JVM Heap Size to 640M by setting values -Xmx640M everywhere in OC4J_BI_FORMS/Server Properties/Java Options, Home/Server Properties/Java Options through Enterprise Manager console. Also manually set the values in OPMN.XML and reloaded the same. Also set -Xmx640M in Jinitiator 1.3.1.30 Java Runtime Parameters. Also set in Java console. All settings have no effect.
We have written a small program to display the run time memory from forms, which displays only maximum memory 63M all the time.
PACKAGE BODY HeapSize IS
-- DO NOT EDIT THIS FILE - it is machine generated!
args JNI.ARGLIST;
-- Constructor for signature ()V
FUNCTION new RETURN ORA_JAVA.JOBJECT IS
BEGIN
args := NULL;
RETURN (JNI.NEW_OBJECT('HeapSize', '()V', args));
END;
-- Method: getTotalMemory ()D
FUNCTION getTotalMemory(
obj ORA_JAVA.JOBJECT) RETURN NUMBER IS
BEGIN
args := NULL;
RETURN JNI.CALL_DOUBLE_METHOD(FALSE, obj, 'HeapSize', 'getTotalMemory', '()D', args);
END;
-- Method: getMaxMemory ()D
FUNCTION getMaxMemory(
obj ORA_JAVA.JOBJECT) RETURN NUMBER IS
BEGIN
args := NULL;
RETURN JNI.CALL_DOUBLE_METHOD(FALSE, obj, 'HeapSize', 'getMaxMemory', '()D', args);
END;
BEGIN
NULL;
END;
declare
obj ORA_JAVA.JOBJECT;
BEGIN
obj:=HeapSize.new;
message('Total memory '||HeapSize.getTotalMemory(obj));
message('Max memory '||HeapSize.getMaxMemory(obj));
END;
Below procedure is for writing to Excel file.
============================================
PACKAGE BODY UWWriteExcel IS
-- DO NOT EDIT THIS FILE - it is machine generated!
args JNI.ARGLIST;
-- Constructor for signature ()V
FUNCTION new RETURN ORA_JAVA.JOBJECT IS
BEGIN
args := NULL;
RETURN (JNI.NEW_OBJECT('UWWriteExcel', '()V', args));
END;
-- Method: copyExcel (Ljava/lang/String;Ljava/lang/String;)V
PROCEDURE copyExcel(
obj ORA_JAVA.JOBJECT,
a0 VARCHAR2,
a1 VARCHAR2) IS
BEGIN
args := JNI.CREATE_ARG_LIST(2);
JNI.ADD_STRING_ARG(args, a0);
JNI.ADD_STRING_ARG(args, a1);
JNI.CALL_VOID_METHOD(FALSE, obj, 'UWWriteExcel', 'copyExcel', '(Ljava/lang/String;Ljava/lang/String;)V', args);
END;
-- Method: getSpreadSheetPara (Ljava/lang/String;)V
PROCEDURE getSpreadSheetPara(
obj ORA_JAVA.JOBJECT,
a0 VARCHAR2) IS
BEGIN
args := JNI.CREATE_ARG_LIST(1);
JNI.ADD_STRING_ARG(args, a0);
JNI.CALL_VOID_METHOD(FALSE, obj, 'UWWriteExcel', 'getSpreadSheetPara', '(Ljava/lang/String;)V', args);
END;
-- Method: openSheet (I)V
PROCEDURE openSheet(
obj ORA_JAVA.JOBJECT,
a0 NUMBER) IS
BEGIN
args := JNI.CREATE_ARG_LIST(1);
JNI.ADD_INT_ARG(args, a0);
JNI.CALL_VOID_METHOD(FALSE, obj, 'UWWriteExcel', 'openSheet', '(I)V', args);
END;
-- Method: getCellValues (IID)V
PROCEDURE getCellValues(
obj ORA_JAVA.JOBJECT,
a0 NUMBER,
a1 NUMBER,
a2 NUMBER) IS
BEGIN
args := JNI.CREATE_ARG_LIST(3);
JNI.ADD_INT_ARG(args, a0);
JNI.ADD_INT_ARG(args, a1);
JNI.ADD_DOUBLE_ARG(args, a2);
JNI.CALL_VOID_METHOD(FALSE, obj, 'UWWriteExcel', 'getCellValues', '(IID)V', args);
END;
-- Method: getCellValues (IILjava/lang/String;)V
PROCEDURE getCellValues(
obj ORA_JAVA.JOBJECT,
a0 NUMBER,
a1 NUMBER,
a2 VARCHAR2) IS
BEGIN
args := JNI.CREATE_ARG_LIST(3);
JNI.ADD_INT_ARG(args, a0);
JNI.ADD_INT_ARG(args, a1);
JNI.ADD_STRING_ARG(args, a2);
JNI.CALL_VOID_METHOD(FALSE, obj, 'UWWriteExcel', 'getCellValues', '(IILjava/lang/String;)V', args);
END;
-- Method: exportExcel ()V
PROCEDURE exportExcel(
obj ORA_JAVA.JOBJECT) IS
BEGIN
args := NULL;
JNI.CALL_VOID_METHOD(FALSE, obj, 'UWWriteExcel', 'exportExcel', '()V', args);
END;
-- Method: copy (Ljava/lang/String;Ljava/lang/String;)V
PROCEDURE copy(
a0 VARCHAR2,
a1 VARCHAR2) IS
BEGIN
args := JNI.CREATE_ARG_LIST(2);
JNI.ADD_STRING_ARG(args, a0);
JNI.ADD_STRING_ARG(args, a1);
JNI.CALL_VOID_METHOD(TRUE, NULL, 'UWWriteExcel', 'copy', '(Ljava/lang/String;Ljava/lang/String;)V', args);
END;
BEGIN
NULL;
END;
declare
obj ORA_JAVA.JOBJECT;
BEGIN
message('-1');pause;
obj:=UWWriteExcel.new;
message('0');pause;
UWWriteExcel.copyExcel(obj,'C:\\excel\\CAT2009WS.XLS','C:\\excel\\CAT2009WS.XLS');
message('1');pause;
UWWriteExcel.openSheet(obj,0);
message('2');pause;
UWWriteExcel.getCellValues(obj,6,2,900);
message('3');pause;
UWWriteExcel.getCellValues(obj,7,2,911);
message('4');pause;
UWWriteExcel.exportExcel(obj);
END;
When the size of XL is more than 7Mb, after message(0) it will be display oracle error.
From command prompt if we run the same java class file by passing -Xmx256m parameter we are able to write to big XL file.
Can anyone tell me where I am wrong... Can we increase the JVM Heap Size from forms...

I have a simular problem.
Via Forms I call a Java class (import Java class -> PL/SQL class java method).
For this specific process I need to set the Xmx java option...
How do I do this ?
Changing the java option for the Forms-OC4J in the EM doesn't help.
Is there an other level where I can modify this ?
Does the java process of the forms is the single process that exists ? How does he handles such java calls?
Are that separed java processes ? threads ? ....
Thanks !!!

Change your JVM heap size

Can you please let me know how to increase the JVM Heap Size -- on linux fedora 6.0.
Thank you,

See -Xmx
http://java.sun.com/javase/6/docs/technotes/tools/solaris/java.html

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How do I increase the JVM heap size

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