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POUsing equals and == for comparisson
 

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  1. POUsing equals and == for comparisson
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    <p>I have a condition like this :</p> <pre><code>try { History history = requestHelper.getHistory(); if (!history.getInvoiceNo().equalsIgnoreCase("") || //String !history.getCcEmail().equalsIgnoreCase("") || //String !history.getHostAuthCode().equalsIgnoreCase("") || //String !history.getMerchantCategory().equalsIgnoreCase(null) || //String !history.getCcName().equalsIgnoreCase("") || //String !history.getCcPhone().equalsIgnoreCase("") || //String history.getBatchNo() != 0 || //int !history.getIpAddress().equalsIgnoreCase("") || //String !history.getTransactionStatus().equals(null)) { //char System.out.println(": : : FAILED GET HISTORY, NO PARAMETER SET!"); requestHelper.getResultHelper().setLstHistoryTransaction(null); else { System.out.println(": : : SUCCESS GET HISTORY!"); /* some command */ } } catch (Exception ex) { System.out.println(": : : ERROR QUERYING HISTORY TO DATABASE"); ex.printStackTrace(); } </code></pre> <p>but when i dont fill any variable on that parameters, why it getting error like this :</p> <blockquote> <p>10:07:35,238 INFO [STDOUT] : : : ERROR QUERYING HISTORY TO DATABASE<br> 10:07:35,238 ERROR [STDERR] java.lang.NullPointerException<br> 10:07:35,238 ERROR [STDERR] at doku.edp.executors.ManageTransactionExecutorBean.findHistoryTransaction(ManageTransactionExecutorBean.java:411)<br> 10:07:35,238 ERROR [STDERR] at doku.edp.executors.ManageTransactionExecutorBean.execute(ManageTransactionExecutorBean.java:78)<br> 10:07:35,239 ERROR [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)<br> 10:07:35,239 ERROR [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)<br> 10:07:35,239 ERROR [STDERR] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)<br> 10:07:35,239 ERROR [STDERR] at java.lang.reflect.Method.invoke(Method.java:597)<br> 10:07:35,239 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeTarget(MethodInvocation.java:122)<br> 10:07:35,239 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:111)<br> 10:07:35,239 ERROR [STDERR] at org.jboss.ejb3.EJBContainerInvocationWrapper.invokeNext(EJBContainerInvocationWrapper.java:69)<br> 10:07:35,239 ERROR [STDERR] at org.jboss.ejb3.interceptors.aop.InterceptorSequencer.invoke(InterceptorSequencer.java:73)<br> 10:07:35,239 ERROR [STDERR] at org.jboss.ejb3.interceptors.aop.InterceptorSequencer.aroundInvoke(InterceptorSequencer.java:59) 10:07:35,239 ERROR [STDERR] at sun.reflect.GeneratedMethodAccessor402.invoke(Unknown Source)<br> 10:07:35,239 ERROR [STDERR] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)<br> 10:07:35,239 ERROR [STDERR] at java.lang.reflect.Method.invoke(Method.java:597)<br> 10:07:35,239 ERROR [STDERR] at org.jboss.aop.advice.PerJoinpointAdvice.invoke(PerJoinpointAdvice.java:174)<br> 10:07:35,239 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)<br> 10:07:35,239 ERROR [STDERR] at org.jboss.ejb3.interceptors.aop.InvocationContextInterceptor.fillMethod(InvocationContextInterceptor.java:72)<br> 10:07:35,239 ERROR [STDERR] at org.jboss.aop.advice.org.jboss.ejb3.interceptors.aop.InvocationContextInterceptor_z_fillMethod_613521570.invoke(InvocationContextInterceptor_z_fillMethod_613521570.java)<br> 10:07:35,239 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)<br> 10:07:35,239 ERROR [STDERR] at org.jboss.ejb3.interceptors.aop.InvocationContextInterceptor.setup(InvocationContextInterceptor.java:88)<br> 10:07:35,239 ERROR [STDERR] at org.jboss.aop.advice.org.jboss.ejb3.interceptors.aop.InvocationContextInterceptor_z_setup_613521570.invoke(InvocationContextInterceptor_z_setup_613521570.java)<br> 10:07:35,239 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)<br> 10:07:35,239 ERROR [STDERR] at org.jboss.ejb3.connectionmanager.CachedConnectionInterceptor.invoke(CachedConnectionInterceptor.java:62)<br> 10:07:35,239 ERROR [STDERR] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)<br> 10:07:35,239 ERROR [STDERR] at org.jboss.ejb3.entity.TransactionScopedEntityManagerInterceptor.invoke(TransactionScopedEntityManagerInterceptor.java:56) </p> </blockquote>
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    1. USapaul
    1. USDiaz Pradiananto
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      1. POUsing equals and == for comparisson
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    1. COplease print all `history.` and see what you get... Might that will come to know why you are getting `Null Pointer Exception`
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      1. USFahim Parkar
    2. COMay I ask what the reason is, to compare an empty String in case insensitve way: `.equalsIgnoreCase ("")`. Btw.: For a long time I haven't seen such an ugly code sample.
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