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From: CTH57 (@CTH57) <[email protected]>
To: pgjdbc/pgjdbc <[email protected]>
Subject: [pgjdbc/pgjdbc] issue #3892: org.postgresql.xa.PGXAConnection.prepare(Xid) should return XA_RDONLY
Date: Mon, 08 Dec 2025 10:20:52 +0000
Message-ID: <[email protected]> (raw)

**Describe the issue**
This issue is a possible misalignment of pgjdbc from the XA specification.
PGXAConnection.prepare(Xid) should return XA_RDONLY when the connection is read-only.
Instead, PGXAConnection.prepare(Xid) tries to execute an update on the connection, which inevitably fails.

**Driver Version?** 
42.7.8

**Java Version?**
21.0.6

**OS Version?**


**PostgreSQL Version?**
17.4

**To Reproduce**
Create a XATransaction with at least one readonly connection

**Expected behaviour**
No exception when commit the transaction

**Logs**
```

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  To: github://pgjdbc/pgjdbc
  Cc: [email protected], [email protected]
  Subject: Re: [pgjdbc/pgjdbc] issue #3892: org.postgresql.xa.PGXAConnection.prepare(Xid) should return XA_RDONLY
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