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PO
 

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  1. PO
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    <p>I think I see the problem in your code. Your code is extremely strange but here's what I think is happening:</p> <p>In your <code>ViewStockQuery</code> class, you have the <code>retrieveStock()</code> method. This method then creates an instance of your GUI class, <code>ViewStockGUI</code>. Apart from this being bad practice, it leads to a problem here because in the constructor of the <code>ViewStockGUI</code>, which you called in the <code>retrieveStock()</code> method in this line:</p> <pre><code>stockGUI = new ViewStockGUI(); </code></pre> <p>you then again call <code>retrieveStock()</code> with this line:</p> <pre><code>final ViewStockQuery stock = new ViewStockQuery(); comboGUI = stock.getComboBox(); stock.retrieveStock(); </code></pre> <p>This leads to a recursive issue as your <code>ViewStockGUI()</code> constructor calls the <code>retrieveStock()</code> method which creates a connection and again calls the <code>ViewStockGUI()</code> constructor which will again call the <code>retrieveStock()</code> method that hasn't closed the connection and tries to open a different connection. Hope you get the picture.</p> <p>A way to solve it is to clean up your code. Don't call the constructor in <code>retrieveStock()</code>. Find a different way to pass the selected category for your query.</p> <p>Edit:</p> <p>Write you <code>ViewStockQuery</code> like so:</p> <pre><code>private String mSelected; public ViewStockQuery(String selectedCategory) { mSelected = selectedCategory; } ... public void retrieveStock() throws SQLException { con = SQLConnect.getConnection(); String viewStock = "SELECT * FROM Stock where categoryName = '" + "'" + mSelected + "'"; System.out.println(viewStock); try { ... </code></pre> <p>Then write your <code>ViewStockGUI</code> in such a way that when a category has been selected, that is when you create the <code>ViewStockQuery</code> and pass in the selected string.</p> <p>Edit:</p> <p>Like I said before, there are quite a lot of things you will eventually need to change in your code. But, for the purpose of this issue, what you could do is in your <code>ViewStockGUI</code>, do:</p> <pre><code>String selected = (String)combo.getSelectedItem(); final ViewStockQuery stock = new ViewStockQuery(selected); </code></pre> <p>The first line collects the selected category from your combobox and the second line creates an instance of <code>ViewStockQuery</code> and passes the selected to the constructor. This will then initialize mSelected as you see in the constructor I put above for <code>ViewStockQuery</code>.</p>
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    1. POJava using JDBC - Too many connections?
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    1. USugo
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    1. COOk ill look into this.
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      1. PO
      1. USLiam Bull
    2. COYou put private mSelected; What is this meant to be? A string? bit confused by this.
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      1. USLiam Bull
    3. CO@LiamBull, whoops. Sorry, it is meant to be a String. Corrected.
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