From: Joe Shevland <shevlandj@kpi.com.au>
To: pgsql-interfaces@postgresql.org
Subject: Large Object Exception/Serializing Java Objects
Date: Fri, 10 Dec 1999 11:34:43 -0800
Message-ID: <001101bf4345$9f502f60$6464a8c0@kpi.com.au> (raw)
Hi all,
I'm trying to persist some Java objects in a PostgreSQL database using JDBC
(2.0).
I get the following error:
Fri Dec 10 11:26:15 PST 1999 - [copyright] EJBoss - The EJB Open Source
Server v0.9
Fri Dec 10 11:26:48 PST 1999 - [Exception]
Fri Dec 10 11:26:48 PST 1999 - FastPath protocol error: Z
FastPath protocol error: Z
at postgresql.fastpath.Fastpath.fastpath(Fastpath.java:159)
at postgresql.fastpath.Fastpath.fastpath(Fastpath.java:188)
at postgresql.fastpath.Fastpath.getInteger(Fastpath.java:200)
at
postgresql.largeobject.LargeObjectManager.create(LargeObjectManager.java:176
)
at
org.ejboss.storage.PGSecondaryStorage.serialize(PGSecondaryStorage.java:245)
at org.ejboss.storage.PGSecondaryStorage.store(PGSecondaryStorage.java:117)
at
org.ejboss.ejb.EnterpriseBeanWrapper.passivate(EnterpriseBeanWrapper.java:34
3)
at
org.ejboss.managers.EnterpriseBeanWrapperManager$LRUThread.run(EnterpriseBea
nWrapperManager.java:403)
at java.lang.Thread.run(Thread.java:479)
This occurs upon trying to create the large object... before going to the
source I just wanted to check that this is supposed to work and all that.
Out of interest, here's the offending code fragment (it may be just plain
wrong... any ideas appreciated!):
private int serialize(EnterpriseBean bean)
throws IOException, SQLException
{
ByteArrayOutputStream byte_out = new ByteArrayOutputStream();
ByteArrayInputStream byte_in;
ObjectOutputStream obj_out = new ObjectOutputStream(byte_out);
byte[] classbytes;
byte buf[] = new byte[2048];
int read=0;
// lobj was created in the constructor...
// Create the ejb object using the PostgreSQL specific blob support
int oid =
lobj.create(LargeObjectManager.READ|LargeObjectManager.WRITE);
LargeObject obj = lobj.open(oid,LargeObjectManager.WRITE);
DriverManager.println("[PGSecondaryStorage] Got large object
obj="+obj);
// Copy the EJB to a temporary byte array
obj_out.writeObject( bean );
obj_out.flush();
classbytes = byte_out.toByteArray();
byte_in = new ByteArrayInputStream(classbytes);
// Copy the data to the large object
while((read=byte_in.read(buf,0,2048))>0) {
obj.write(buf,0,read);
}
obj.close();
return oid;
}
Thanks,
Joe.
---
Joe Shevland
Principal Consultant
KPI Logistics Pty Ltd
mailto:shevlandj@kpi.com.au
http://www.kpi.com.au
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To: pgsql-interfaces@postgresql.org
Cc: shevlandj@kpi.com.au
Subject: Re: Large Object Exception/Serializing Java Objects
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