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<title>Berkeley DB: DbEnv.set_errcall</title>
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<h1>DbEnv.set_errcall</h1>
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<h3><pre>
import com.sleepycat.db.*;
<p>
public interface DbErrcall
{
public abstract void errcall(String errpfx, String msg);
}
public class DbEnv
{
public void set_errcall(DbErrcall errcall);
...
}
</pre></h3>
<h1>Description</h1>
When an error occurs in the Berkeley DB library, an exception is thrown. In
some cases, however, the <b>errno</b> value may be insufficient to
completely describe the cause of the error, especially during initial
application debugging.
<p>The DbEnv.set_errcall and <a href="../api_java/db_set_errcall.html">Db.set_errcall</a> methods are used to
enhance the mechanism for reporting error messages to the application.
The DbEnv.set_errcall and <a href="../api_java/db_set_errcall.html">Db.set_errcall</a> methods must be
called with a single object argument. The object's class must implement
the DbErrcall interface. In some cases, when an error occurs, Berkeley DB
will invoke the object's errcall() method with two arguments; the first
is the prefix string (as previously set by <a href="../api_java/db_set_errpfx.html">Db.set_errpfx</a> or
<a href="../api_java/env_set_errpfx.html">DbEnv.set_errpfx</a>), the second will be an error message string.
It is up to this method to display the message in an appropriate
manner.
<p>Alternatively, you can use the <a href="../api_java/env_set_error_stream.html">DbEnv.set_error_stream</a> and
<a href="../api_java/db_set_error_stream.html">Db.set_error_stream</a> methods to display the additional information via
an output stream. You should not mix these approaches.
<p>This error-logging enhancement does not slow performance or significantly
increase application size, and may be run during normal operation as well
as during application debugging.
<p>The DbEnv.set_errcall interface may be called at any time during the life of
the application.
<h1>Class</h1>
<a href="../api_java/env_class.html">DbEnv</a>
<h1>See Also</h1>
<a href="../api_java/env_list.html">Database Environments and Related Methods</a>
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