I want to implement Kafka producer which sends and receives Java Serialized Objects. I tried this: Producer: } Send object: Consumer: // Receive Object When I deploy the Producer I get error during deployment: Caused by: org.apache.kafka.common.KafkaException: class org.engine.plugin.transactions.factory.Sale…
Tag: spring
Spring Boot :Deleting a blog posts shared tag only when the last post that has it is deleted
I have a dilemma trying to get a solution for this issue. I have two (can be any number) blog posts that share the same tag. I have a set of tags for each added post so duplicate tags are not possible, so lets say I add first post with the tags “car” and “blue” and the second post with
How to not persist sqlSession.selectOne returned value?
My goal is to not persist the SqlSession.selectOne returned value. The problem is, if you do a sqlSession.selectOne (using an API endpoint) and then you edit the database directly for example using the MySQL workbench. After you edit the database and do another API endpoint request, the returned value will no…
How to join several validation annotations
I have following annotation to validate password: But spring validation does not recognize this rules. I used this annotation as: How can I get it without defining ConstraintValidator instance? Answer If you want to use ConstraintValidator, you can do it like this: create Password annotation : then create the…
Spring Rest Template Injects Value into Parameter with %
Can someone please explain to me what is happening in the following code? If I run: Spring tells me that the URL used is https://example.com/../username/path where username = user%25123 even though I set the username = user%123. This is looking to me to be not a Spring issue, rather a URL encoding issue, but …
is there anyway to connect spring boot with tcps to database?
I’m using oracle database 12c and spring boot 2.3 with data JPA. My goal is to connect with the wallet throw TCPS to the database. There is no example or guides for this on the net as I searched. Can anyone explain and show some examples for this? Answer How to connect to Oracle from Java? Commonly, in …
Spring PropertySourcesPlaceholderConfigurer beans: resolve property value at runtime
I am loading properties with multiple PropertySourcesPlaceholderConfigurer beans and setting placeholder prefix-es: While I can inject a property value by specifying it’s index and key like this: Sometimes I need to determine the value of the prefix (‘foo’) at runtime and dynamically resolve…
user detail service cannot be cast to user in a unnamed module loader app
I don’t know what I did wrong. I was trying to implement the Jwt token(only post method).it shows the exception that Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.ClassCastException: class com.vivek.dis…
noHandlerFound in Spring for CSS
I am learning Spring MVC and I try to get some experience. I wrote an app and deployed it to Tomcat serve. At run time, the browser gets a 404 code for the CSS and Tomcat “WARNING [http-nio-8080-…
hibernate validator throws exception ValidationException: HV000028 for @Past annotation
I am validating an entity with a hibernate validator in a spring boot project. I got an exception for the Date validator @Past . I faced javax.validation.ValidationException: HV000028: Unexpected exception during isValid call This is the dependency I have in my gradle.build file implementation ‘org.spri…