Java - Read For Learn

Why is there no Constant feature in Java?

Every time I go from heavy C++ coding to Java, it takes me a little while to adapt to the lack of const-correctness in Java. This usage of const in C++ is much different than just declaring constant variables, if you didn’t know. Essentially, it ensures that an object is immutable when accessed through a special kind of pointer … Read more

Recompile with -Xlint:unchecked for detail error in java

When you compile the code use this: Then you will see: So bottom line, the problem is due to the creation of the generic type array. To solve this read this link: https://stackoverflow.com/a/530289/588532

How to override compareTo (Java)

As I see you have wrong implementation of compare method. Could you update it to?

Recursive print Factorial

return factValue * printFactorial(factValue – factCounter); I assume that you should be using the “next” values instead of these. Edit: Also note that the function takes two parameters and is void. Returning factValue times void doesn’t make sense.

Print ArrayList

I have an ArrayList that contains Address objects. How do I print the values of this ArrayList, meaning I am printing out the contents of the Array, in this case numbers. I can only get it to print out the actual memory address of the array with this code:

Remote debugging a Java application

Edit: I noticed that some people are cutting and pasting the invocation here. The answer I originally gave was relevant for the OP only. Here’s a more modern invocation style (including using the more conventional port of 8000): Original answer follows. Try this: Two points here: No spaces in the runjdwp option. Options come before the class name. … Read more

“NoClassDefFoundError: Could not initialize class” error

When I run my project, I get numerous outputs of this error: Sep 9, 2009 8:22:23 AM org.apache.catalina.core.StandardWrapperValve invoke SEVERE: Servlet.service() for servlet Jersey threw exception java.lang.NoClassDefFoundError: Could not initialize class SpringFactory at com.point2.prospect.persistence.hibernate.HibernateTransactionInterceptor.doFilter(HibernateTrans actionInterceptor.java:17) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at com.point2.prospect.restapi.ServerErrorInterceptor.doFilter(ServerErrorInterceptor.java:27) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) … Read more

“NoClassDefFoundError: Could not initialize class” error

Javadoc @see or {@link}?

The official guidelines on this are pretty clear. The functional differences are: {@link} is an inline link and can be placed wherever you like @see creates its own section In my opinion, {@link} is best used when you literally use a class, field, constructor or method name in your description. The user will be able to click through to the javadoc … Read more

org.hibernate.HibernateException: Access to DialectResolutionInfo cannot be null when ‘hibernate.dialect’ not set

First remove all of your configuration Spring Boot will start it for you. Make sure you have an application.properties in your classpath and add the following properties. If you really need access to a SessionFactory and that is basically for the same datasource, then you can do the following (which is also documented here although for XML, not JavaConfig). That way … Read more

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