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POtry-catch exception handling java
 

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    <p>I was on the way to finish this but some rollback happaned, so when I am trying to write in text file using try-catch it gives me such error:</p> <pre><code>Exception in thread "main" java.lang.NullPointerException </code></pre> <p>It is pointing to this line :</p> <pre><code>output.format("%-10s%-20s%-20s%-20s%-20s%-20s%-20s%-20s%n", .... </code></pre> <p>I read that can happen because the object referenced is <code>null</code> or something. But before the output line I tried to output all values with <code>system.out.println()</code> , and there was no problem with that.</p> <p>Is there some solution to that ?</p> <pre><code>try { record.setIncome(input.nextDouble()); record.setAtv(atv_sum); record.setSumAtv(atv_sum+45.00); DecimalFormat df = new DecimalFormat("#.###"); double soc_apd=(((record.getIncome()-record.getSumAtv())/simt)*soc_proc); double iedz=((((record.getIncome()-record.getSumAtv()-soc_apd))/simt)*iedz_proc); df.format(iedz); double netto =record.getIncome()-(iedz+soc_apd); if((record.getIncome()&gt;=min_alga)){ output.format("%-10s%-20s%-20s%-20s%-20s%-20s%-20s%-20s%n", year_n, months[month_n], df.format(record.getIncome()), df.format(record.getAtv()), df.format(record.getSumAtv()), df.format(iedz), df.format(soc_apd), df.format(netto)); }else{ String error_1 = "Kļūda ! Alga ievadÄ«ta zem 0 vai minimÄ?lÄ?s algas "+min_alga+" LS"; System.err.println(error_1); input.nextLine(); } } catch ( FormatterClosedException formatterClosedException ){ System.err.println(error_2); return; } catch (NoSuchElementException elementException){ System.err.println(error_3); input.nextLine(); } </code></pre> <p>I found which record couses the problem . Output is like this:</p> <p>so the <code>df.format(record.getIncome())</code> couses the problem</p> <pre><code>2013 45.0 Exception in thread "main" java.lang.NullPointerException at course.CreateTextFile.addRecords(CreateTextFile.java:163) at course.calc.CreateTextFileTest(calc.java:16) at course.calc.main(calc.java:33) 321.468 165.55 1062.982 1550.0 </code></pre>
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    1. USEdgars
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    1. COMaybe a silly question, but have you defined the variable 'output' elsewhere?
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      1. USAlex Vulaj
    2. COMight be something within df.format(..) is null ...
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    3. CO*"because the object referenced is null or something"* Without something.
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      1. USm0skit0
 

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