[Biojava-l] Sequence serialization exception

[Mark Southern]

I am getting the following exception when trying to serialize a protein
sequence. I am using biojava 1.3. Can anyone please explain to me why?
 
Many thanks,
 
Mark.
 
 
java.io.InvalidObjectException: Couldn't resolve symbol:SER
        at
org.biojava.bio.symbol.AlphabetManager$WellKnownAtomicSymbol$OPH.readResolve
(AlphabetManager.java:1441)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39
)
        at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl
.java:25)
        at java.lang.reflect.Method.invoke(Method.java:324)
        at
java.io.ObjectStreamClass.invokeReadResolve(ObjectStreamClass.java:911)
        at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1655)
        at
java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
        at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1603)
        at
java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1271)
        at
java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1845)
        at
java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1769)
        at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1646)
        at
java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
        at
java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1845)
        at
java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:452)
        at
org.biojava.bio.seq.impl.SimpleSequence.readObject(SimpleSequence.java:119)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39
)
        at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl
.java:25)
        at java.lang.reflect.Method.invoke(Method.java:324)
        at
java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:824)
        at
java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1746)
        at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1646)
        at
java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
        at
java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1845)
        at
java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:452)
        at org.biojava.bio.seq.ViewSequence.readObject(ViewSequence.java:93)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39
)
        at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl
.java:25)
        at java.lang.reflect.Method.invoke(Method.java:324)
        at
java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:824)
        at
java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1746)
        at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1646)
        at
java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
        at
java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1845)
        at
java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1769)
        at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1646)
        at
java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
        at
java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1845)
        at
java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1769)
        at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1646)
        at
java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:324)
        at java.util.HashMap.readObject(HashMap.java:985)
        at sun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source)
        at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl
.java:25)
        at java.lang.reflect.Method.invoke(Method.java:324)
        at
java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:824)
        at
java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1746)
        at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1646)
        at
java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
        at
java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1845)
        at
java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1769)
        at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1646)
        at
java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:324)
        at java.util.HashMap.readObject(HashMap.java:986)
        at sun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source)
        at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl
.java:25)
        at java.lang.reflect.Method.invoke(Method.java:324)
        at
java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:824)
        at
java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1746)
        at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1646)
        at
java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
        at
java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1845)
        at
java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1769)
        at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1646)
        at
java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:324)
        at com.exsar.hdex.model.calc.Test.main(Test.java:104)