Hi !
Some times my application is hang-up. The stack trace contains the
following:
at java.net.SocketInputStream.socketRead(Native Method)
at java.net.SocketInputStream.read(SocketInputStream.java:86)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:186)
at java.io.BufferedInputStream.read(BufferedInputStream.java:204)
at org.gjt.mm.mysql.MysqlIO.readPacket(Unknown Source)
at org.gjt.mm.mysql.MysqlIO.clearAllReceive(Unknown Source)
at org.gjt.mm.mysql.MysqlIO.sqlQueryDirect(Unknown Source)
at org.gjt.mm.mysql.MysqlIO.sqlQuery(Unknown Source)
at org.gjt.mm.mysql.Connection.execSQL(Unknown Source)
at org.gjt.mm.mysql.Connection.execSQL(Unknown Source)
at org.gjt.mm.mysql.Statement.executeQuery(Unknown Source)
at org.gjt.mm.mysql.jdbc2.Statement.executeQuery(Unknown Source)
It seems that it is not infinite loop (i.e. there was only once
org.gjt.mm.mysql.jdbc2.Statement.executeQuery).
Do you have any idea what is wrong ?
I think that the reason of bug is in the BufferedInputStream (see on Sun
BugParade
http://developer.java.sun.com/developer/bugParade/bugs/4479751.html). MySql
client need to read N bytes from input stream. BufferedInputStream tries to
fill its buffer and try to read from server more than N bytes (to fill
entire buffer). The MySql server has exactly N bytes to send. The server
sends N bytes and waits for a request. But the client doesn't receive
response, since it (or end part of it) is in the BufferedInputStream buffer.
I might be wrong, but I usually see the same stack trace. I need to restart
my application.
Best,
Dmitry.
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