Given the following identity functions: I observe the following behaviour in JDK 11 and JDK 17: Why can’t the compiler resolve these symbols by using the return type of the expression? The curly brace versions work fine, and I would have thought they would be the more difficult cases. I understand that …
Tag: java
Application failed after added swagger configuration
I’m using spring boot and I want to add swagger configuration, the problem is after I run the application I get this error: In my class I added this methods: In my pom.xml I added this dependencies: I can’t understand what is wrong, I followed online solution asking me to add @EnableSwagger2WebMv …
SubEthaSMTP Unexpected error in the SMTP handler thread NoClassDefFoundError jakarta/mail/internet/AddressException
SubEthaSMTP server running fine on port 25001. After a successful authentication from my client code to Subethasmtp server i am having this error message org.subethamail.smtp.server.Session: Unexpected error in the SMTP handler thread java.lang.NoClassDefFoundError: jakarta/mail/internet/AddressException This…
java.lang.StackOverflowError: null [Spring Boot, Hibernate]
I have two classes User.java and Address.java and there is a one-to-one bi-directional mapping between them. But when I try to get the address using the User class I get an “java.lang.StackOverflowError: null” exception. The same thing happens when I try to get the User from the Address class. Use…
How do I install jarsigner on Amazon Linux 2?
My understanding is that jarsigner is packaged with OpenJDK, which I’ve installed by running Now I have a bunch of synlinks to the jdk, like so: However, I don’t have jarsigner in the bin directory: What else do I need to do to install this binary? Answer It appears Amazon follows the RedHat packa…
JavaMail sends no content with SMTP, sends “QUIT” and hangs
I’m trying to use JavaMail 1.6 to send an email to a local MailHog SMTP server in Java 8. The code is: When the code is ran, it will start and establish a session with the server, and step through SMTP until it’s supposed to send data. After this, it sends QUITrn and hangs, not sending any content…
Can I add a delay to a call to a Stub method in Spock?
I’m using the Spock Framework to test some Java classes. One thing I need to do is add a delay to a Stub method that I’m calling, in order to simulate a long-running method. Is this possible? This looks possible using Mockito: Can I delay a stubbed method response with Mockito?. Is it possible usi…
Why can’t a bind variable be used from ojdbc with Oracle JSON_ARRAY() in the presence of FORMAT JSON
In Oracle, the following query: Produces the following JSON document: When I try to run this query with bind variables from JDBC like this: Then I’m getting: I’m using these versions: Database: Oracle Database 21c Express Edition Release 21.0.0.0.0 – Production ojdbc: com.oracle.database.jdb…
PDF Signature invalid but Verfiy Signature with PDFBox2 is valid (true)
Sample PDF download: https://drive.google.com/file/d/12wv1Pb7gh4vCKOGhX4cZ3aOrLSiOo4If/view?usp=sharing So when the PDF is opened in A.Reader (Contineous release) it says the Certificate is invalid as Changes have been made to this document that rendered the signature invalid. But I can’t see what/where…
test framework quit unexpected, Cucumber tests Kotlin intellij
I am trying to run test cases in cucumber for testing a mobile application using IntelliJ. The project code is in kotlin and I am using appium server to run the test case on android emulator. The test cases were working fine but after taking last pull request from project repository on github, the test cases …