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The NullPointerException (NPE) typically occurs when you declare a variable but did not create an object and assign it to the variable before trying to use the contents of the variable.
22 Αυγ 2012 · At the start of your code you're initializing your st[] with request.getParameter("radio" + j); This might come as null. As per the javadoc for getParameter(): Returns the value of a request parameter as a String, or null if the parameter does not exist.
7 Αυγ 2015 · 500 http status code means that the server failed to satisfy the request and that an "unexpected" error happened, I guess that the page "homePage.jsp" is not accessible through this URL, try accessing it via the browser directly to verify.
3 Αυγ 2022 · How to fix NullPointerException. java.lang.NullPointerException is an unchecked exception, so we don’t have to catch it. The null pointer exceptions can be prevented using null checks and preventive coding techniques. Look at below code examples showing how to avoid java.lang.NullPointerException.
25 Οκτ 2005 · Hi, I went to this site : http://www.arco.ifema.es/index.jsp# and then clicked on "English version". Then I got the following page: 500 Servlet Exception java.lang.NullPointerException ...
26 Οκτ 2023 · A NullPointerException can occur for several reasons, but the most common cause is calling an instance method or accessing or modifying an instance variable of a null object. Here’s a simple example: String str = null; System.out.println(str.length()); # Output: # Exception in thread "main" java.lang.NullPointerException
1 Απρ 2022 · You may encounter the ‘error 500:Java.lang.nullpointerexception’ on a Java-based game (like Minecraft) if the game’s installation is corrupt as the game’s modules are not able to perform the designated role.
