CODEWITHSUNDEEP
javadomjaxbout-of-memory
Anurag
Anurag

Reputation: 301

Memory leak with JAXB

I am getting Out of Memory error:

Memory Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
        at org.apache.xerces.dom.CoreDocumentImpl.createElement(CoreDocumentImpl.java:564)

I have a standalone Java program which fetches data from DB and create an XML file using DOM. I get the above error if the data fetched is huge, in my case it is > 1,000,000 records.

I have defined 2GB as heap size while calling the Java class from unix.

I tried it with JAXB, but still do not any significant improvement.

Any suggestions how to improve the code.

Upvotes: 2

Views: 2963

Answers (1)

Joachim Sauer
Joachim Sauer

Reputation: 308149

You should probably avoid loading the entire file into memory at once. To do this, switch from using DOM to another technology such as SAX or StAX. It is a streaming APIs and thus are more suited for handling huge amounts of XML data.

Edit: SAX doesn't support writing, therefore it's not applicable here.

Upvotes: 6

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