Question

I tried to read a text file which have only one line. File size is over 50Mb. When I tried to read it using the following code it gives

java.lang.outofmemory exception jvm
heap size insufficient

I change the java heap memory to 1GB . But still it gives the same exception.

set JAVA_OPTS=-Xms1024m -Xmx1024m

I use foollowing code pragment to read the file.

BufferedReader Filein1=new
BufferedReader(new FileReader( new
File( “C:\ABC\MsgStream.txt” )));
s=Filein1.readLine();

Can some one please tell me how to overcome this problem. Thanks in advance.

Answer 1

The JAVA_OPTS environment variable is only respected by certain applications (for example the wrapper scripts that are typically used to launch Tomcat). The java command doesn’t pay any attention to it.

You need to put the options on the java command line … before the classname; e.g.

java -Xms1024m -Xmx1024m ... some.pkg.MainClass ...

(A 1Gb heap should be more than adequate for buffering a 50Mb file.)