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  1. ,
    via oracle.com by Unknown author

    An easy way to solve OutOfMemoryError in java is to increase the maximum heap size by using JVM options -Xmx512M, this will immediately solve your OutOfMemoryError.

  2. ,
    via Stack Overflow by Eugene Yokota

    In Eclipse : go to Run --> Run Configurations --> then select the project under maven build --> then select the tab "JRE" --> then enter -Xmx1024m.

    This should increase the memory heap for all the builds/projects. The above memory size is 1 GB.

java.lang.OutOfMemoryError: Java heap space	at java.util.Arrays.copyOf(Unknown Source)	at java.lang.AbstractStringBuilder.expandCapacity(Unknown Source)	at java.lang.AbstractStringBuilder.ensureCapacityInternal(Unknown Source)	at java.lang.AbstractStringBuilder.append(Unknown Source)	at java.lang.StringBuffer.append(Unknown Source)	at java.util.regex.Matcher.appendReplacement(Unknown Source)	at java.util.regex.Matcher.replaceAll(Unknown Source)	at java.lang.String.replace(Unknown Source)	at com.relevantcodes.extentreports.HTMLReporter.flush(HTMLReporter.java:174)	at com.relevantcodes.extentreports.Report.flush(Report.java:464)	at com.relevantcodes.extentreports.ExtentReports.flush(ExtentReports.java:902)