I am writing list object's into a CSV file by using StringBuffer object, when the list contains less data our logic is working perfectly but when there is a large amount of data the in list then there's a problem and I get the error: java.lang.OutOfMemoryError: Java heap space problem
Code snippet as follows :
StringBuffer report = new StringBuffer();
String[] column = null;
StringReader stream = null;
for (MassDetailReportDto dto: newList.values()) {
int i = 0;
column = new String[REPORT_INDEX];
column[i++] = dto.getCommodityCode() == null ? " " : dto.getCommodityCode();
column[i++] = dto.getOaId() == null ? " " : dto.getOaId();
//like this we are calling some other getter methods
//After all getter methods we are appending columns to stringBuffer object
report.append(StringUtils.join(column, PIPE));
report.append(NEW_LINE);
//now stringbuffer object we are writing to file
stream = new StringReader(report.toString());
int count;
char buffer[] = new char[4096];
while ((count = stream.read(buffer)) > -1) {
//writing into file
writer.write(buffer, 0, count);
}
writer.flush();
//clearing the buffer
report.delete(0, report.length());
}
Error is :
java.lang.OutOfMemoryError: Java heap space
at java.lang.AbstractStringBuilder.expandCapacity(AbstractStringBuilder.java:99)
at java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:393)
at java.lang.StringBuilder.append(StringBuilder.java:120)
Could you please look into above code snippet and help me, it would be great help.
Where does column get initialized? I don't see it. But it seems that's a likely culprit. You are building a string array without clearing it out. column[i++] . Where do you clear out that array? It should be scoped to the loop body, not outside of it. So inside loop, declare your String[] column and use it within that scope.
Collected from the Internet
Please contact [email protected] to delete if infringement.
Comments