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