I’m new to JPA and Hibernate and I have a problem with optimistic locking. I have a class which has an @Version annotated field. When I update the Entity represented by this class, the version counter does not increase. Here is my code: The class: and here is the main method: and here is what the consol…
Do I need to restart my system after setting JAVA in system environment’s path variable?
I did the following steps but java does not seem to be working for me, do I need to restart my system if yes then why? i am getting below error while running java in cmd Answer No, but you will need to close and recreate any cmd windows, running java programs, or the like. To check it’s correct, open
How to perform deeper matching of keys and values with assertj
Say I have a class like this: And later, a Map Using assertj, what is the best way to test that characterAges includes the “Frodo” character? For the age, I can do: And I know I could do: But then I lose my fluency. What I really want it something like this: Or even better, so that I can make
JAVA RMI wrong return type generated by WSimport tool
I am building a web service that includes some methods to do a specific job here is one of the web inferface methods: @WebMethod public DatingUserInfo[] GetAll(String gender); this method should …
Using Intellij to select block between parentheses () or brackets [] or curly brackets {} either with keyboard or mouse
I’ve started working with IntelliJ and I really like it, but there are a few features which I miss compared with Eclipse. One of which is selecting blocks between {}, (), or [] or jumping between the opening/closing of a block. For example, in eclipse if you double click just after an opening parenthese…
Pattern to extract text between parenthesis
How to extract string from “(” and “)” using pattern matching or anything. For example if the text is “Hello (Java)” Then how to get only “Java”? Answer Try this: or
Why during the install phase of maven cycle, package phase is called as well?
I have in my pom.xml a section where i want to install the Weblogic plugin to my local repository. Note i indicated that i want this to be done in install phase. Then i want to use this plugin but in package and deploy phases. However when i try to run mvn install the package phase is invoked as well
How do I execute a method at a particular time in java?
Is there any way to write a program in java, so that its main method schedule (or at a 10-15 min interval) another method to executes it at a particular interval? Answer I think you are looking for the Time class. See Timer Class API You can use this class like: You want to perform a Method every 600 miliseco…
How do I add a line break in my Twilio SMS message?
Using Java/Scala. I am sending this string (an sms message) to a user mobile number by a Twilio Account. This goes out to the user mobile, in 1 line. I want a newline after the first sentence. I want the user to receive: How can I enter a line break? Answer If you are using an official Twilio library, the
JAX-RS MessageBodyReader
I’m learning how the MessageBodyReader method works from the providers. I see the method returns an object and I’m not sure how to access the object from a service. Could I get an explanation on how to get the object returned from the reader class? This would help me apply a reading rule for all D…