Jar file Loading takes JVM memory ?

[ksrashmi]

Hi ,

does jar file loaidng will consume the jvm memory ?

I have to run the cronjobs for some of the java files . so i have writen the .sh file ( linux server)

This is the Script file

temp_path=/bin:/usr/sbin:/usr/bin
export temp_path
 
#Setting java commands & classpaths
javac=/usr/local/jdk1.5.0_03/bin/javac
java=/usr/local/jdk1.5.0_03/bin/java
lib=/home/rashmi/tomcat1/lib
JAVA_OPTS="-Djava.awt.headless=true" ; export JAVA_OPTS
echo "$JAVA_OPTS"
cjar=.
for i in $lib/*.jar
do
    cjar=$cjar:$i
done
 
cjar=$cjar:/home/rashmi/ValYouAdd/jakarta-tomcat-5.0.28/common/lib/servlet-api.jar
cjar=$cjar:$lib/../classes
#echo "CLASSPATH:$cjar"
 
#Execute  Blocking Check
$java -classpath $cjar com.cerulean.cronjob.systemtask.Test
 

it is working fine in our server . but in client server cronjobs are getting killed .
Hosting people are telling it is using more memory .
I have witen one Java file where there is one One line of system .out.println .
Even that file is getting killed .
Will the Jar file loading consume the memory

beaucse lib=/home/rashmi/tomcat1/lib will load all the jar files

i tried to give specific jar files insted of loading all the jars but it is not compliing the java file
example lib=/home/rashmi/tomcat1/lib/mail.jar

Please help me on this thanks

[JosAH]

Java is extremely cheap when it comes to loading classes (and it doesn't matter whether those classes come from .jar files or not). For user classes only the to be used classes are actually loaded. Entire jar files are not loaded when one or two classes are needed.

Does your client machine have considerably less memory than your server machine? What actually does your Java program want to accomplish?

kind regards,

Jos

[ksrashmi]

We have several back end script like creating PDF reports and sending those . and few other Reports .

And We are using the Hibernate for database connectivity

Client System JVM memory is 128 MB . even our local server is of 128 MB .

But Hosting People have told to restrict to use only 50 MB for the back end script .

i am trying check how much memory it is taking

System.out.println("Max Mem in reports= "+RT.maxMemory()/DIV);
System.out.println("Allocated Mem Rerports : " + RT.totalMemory()/DIV);
System.out.println("Free Mem: " + RT.freeMemory()/DIV);

i used Runtime methods to get the memory details .
this shows 90MB as free memory .
Is this correct way to check the memory usage ?