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    <pre><code>public void waitForConnection() throws IOException { connection = server.accept(); ConnectionArray.add(connection); ConnectionHandler connections = new ConnectionHandler(connection); connection = null; } </code></pre> <p><code>connection</code> is not found, so either this is not the actual code, or you are storing this temporary variable in a member or global. In either case, increasing the scope of temporary variables to span different functions is bad, with multiple threads its like juggling chainsaws. BTW: It would be more natural to store the connection handlers in a list than creating them and storing their sockets in a list. This is a case where the responsibilities are unclear, leading to unclear and buggy code.</p> <p>While the above case could be harmless still, it still shows bad and dangerous style. You keep on with this style (at least it's consistent!) with "...it takes a socket X and sets it to the global socket as shown...":</p> <pre><code>static Socket Socket; public ConnectionHandler(Socket X) { this.Socket = X; } </code></pre> <p>Making <code>Socket Socket</code> static, it is shared between all instances of this class, which is obviously not what you want. You should now know why globals are considered bad and why class-statics are only globals in disguise.</p> <p>Summary: Decide who accesses which parts. If it's just one object, make the parts private members, so the compiler makes sure it's really only one object. Try not to share state. If multiple objects and threads access an object, plan how they don't get in each others way.</p>
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    1. USUlrich Eckhardt
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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