Thread death and xml files when analyzing large datasets

Question

i analyze large data sets. for example:
4000 persons that each have a time series with 8,000 data points. i do this linearly, so (i think) i am only running the
*public static void main(String[] args) { .... }*
for(Person person : PersonSet) {  // there are 4,000 people
  List<Data> data = DataSink.getData();  // each List has a size of 8,000
  analyzer.analyze(person, data); // i do not start any threads in this method
}i've run into, and over come, java.lang.OutOfMemoryError issues.
now, my program runs fine for over two minutes, then it crashes and shows this error:
C:\Documents and Settings\David\My Documents\NetBeansProjects\Test\nbproject\build-impl.xml:419: The following error occurred while executing this line:
C:\Documents and Settings\David\My Documents\NetBeansProjects\Test\nbproject\build-impl.xml:286: java.lang.ThreadDeath
this is how i expand memory:
-Xms1250m -Xmx1250m
i cannot understand how run-time memory management relates to xml files.?
my IDE is NetBeans 6.1

Answer 1

i've never dealt with ANT scripts, so this is like my first "Hello World" programming with ANT.
yet,
i can't understand why the jvm would say that the origin of a crash in a program thats be running for over 2-minutes
would be in an ANT file?
#more build-impl.xml
    <target name="-init-macrodef-java">
        <macrodef name="java" uri="http://www.netbeans.org/ns/j2se-project/1">
            <attribute default="${main.class}" name="classname"/>
            <element name="customize" optional="true"/>
            <sequential>
// line #286                <java classname="@{classname}" dir="${work.dir}" fork="true">   // <--- line #286
                    <jvmarg line="${run.jvmargs}"/>
                    <classpath>
                        <path path="${run.classpath}"/>
                    </classpath>
                    <syspropertyset>
                        <propertyref prefix="run-sys-prop."/>
                        <mapper from="run-sys-prop.*" to="*" type="glob"/>
                    </syspropertyset>
                    <customize/>
                </java>
            </sequential>
        </macrodef>
    </target>
    <!--
                =================
                EXECUTION SECTION
                =================
            -->
    <target depends="init,compile" description="Run a main class." name="run">
// line #419        <j2seproject1:java>     // <-- line #419
            <customize>
                <arg line="${application.args}"/>
            </customize>
        </j2seproject1:java>
    </target>
    <target name="-do-not-recompile">
        <property name="javac.includes.binary" value=""/>
    </target>
    <target depends="init,-do-not-recompile,compile-single" name="run-single">
        <fail unless="run.class">Must select one file in the IDE or set run.class</fail>
        <j2seproject1:java classname="${run.class}"/>
    </target>
............................thanks