java.lang.OutOfMemoryError: Java heap space
   at java.io.ObjectStreamClass.lookup(ObjectStreamClass.java:0)
   at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:0)
   at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:0)
   at java.util.TreeMap.writeObject(TreeMap.java:0)
   at sun.reflect.GeneratedMethodAccessor290.invoke(GeneratedMethodAccessor290.java:0)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:0)
   at java.lang.reflect.Method.invoke(Method.java:0)
   at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:0)
   at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:0)
   at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:0)
   at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:0)
   at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:0)
   at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:0)
   at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:0)
   at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:0)
   at java.io.ObjectOutputStream.writeArray(ObjectOutputStream.java:0)
   at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:0)
   at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:0)
   at java.util.TreeMap.writeObject(TreeMap.java:0)
   at sun.reflect.GeneratedMethodAccessor290.invoke(GeneratedMethodAccessor290.java:0)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:0)
   at java.lang.reflect.Method.invoke(Method.java:0)
   at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:0)
   at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:0)
   at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:0)
   at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:0)
   at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:0)
   at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:0)
   at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:0)
   at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:0)
   at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:0)
   at org.netbeans.modules.sampler.SamplesOutputStream$Sample.writeToStream(SamplesOutputStream.java:308)