Normally, private methods in a class are not visible to other classes and cannot be executed. However, through reflection, which enables dynamic retrieval of classes and data structures by name, you can still access and execute private methods in another class. Consider the following class, which defines a public method called getValue1 and a...
Read more →Quite a few developers seem to use the compareTo() method to compare Strings, which is a bit odd because the purpose of this method is to provide an ordering (i.e. Comparable interface) rather than testing for equality. Likely they have been taught to do String comparisons that way and have become accustomed with that...
Read more →In some odd cases, the ear file that you have deployed to WebSphere may at some point throw a java.lang.NoClassDefFoundError runtime error even though you are certain that the ear file contains all the proper jar files and they are located in all the right places. For instance: java.lang.NoClassDefFoundError: org.apache.woden.resolver.URIResolver This problem may be...
Read more →There are certain cases where you need to use a properties file (ResourceBundle) that can be used in one or more WebSphere Enterprise Applications. One example would be to allow the Application Manager to manage and control properties such as database passwords or other sensitive information that should not come bundled inside various ear/war/jar...
Read more →Assume your Java application is using Crystal Reports from the Repository Server and for whatever reason, for instance testing or debugging, you want to use a local copy of the Crystal Report .rpt file in your project, and not the one from the CR Server. Your original code may look similar to this: And...
Read more →If you need to update the database password for large amount of Crystal Reports, the Crystal Management Console may be too time consuming to change the password for each individual report. A programmatic approach may be more helpful, in that case. On the Crystal Reports server, reports and other objects such as paths, are...
Read more →As of the Java Servlet specification version 2.3, a component type, called a filter, can be used in your Java web applications. A filter dynamically intercepts requests and responses and is most often used to transform the information contained in the requests and responses. One good example of a filter is an XSLT transformation...
Read more →There are several third party libraries that simplify the programming that is needed to make your web pages communicate with the server more dynamically, and without doing complete page reloads. However, some of you may be interested in knowing how exactly AJAX functionality can be added to your web sites and without involving any...
Read more →Tip #1 – Avoid NullPointerException situations When comparing strings against specific values in Java, you can easily avoid the java.lang.NullPointerException problem by specifying the string constant as the first value, and the variable as the parameter. Consider next typical situation: When you swap the constant “John” with the variable firstName, you won’t need to...
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