I’m trying to apply the where condition on the related entity, but the result set contains all the related entity data. It appears like the filter is ignored. I have the following entities: Entity …
Tag: java
how recursive function works level by level?
I have trouble on understating how recursion works, I have been struggling this for a while! Could anyone can help me with this? I’d really appreciate that, and here is the code for instance: when we pass 3 into the function, the output will be: Since the recursion call is between two printings, I guess the way how it works
Are Java classes in Spring automatically a @Bean?
If I create some classes, can I automatically @Autowire those classes somewhere else without using the @Bean, @Component, @Service? Or if I want to @Autowire a class somewhere else, do I need to use the annotations described before? I want to @Autowire a class to another that uses the @Configuration and @ComponentScan annotation For example: or to achieve this.. Answer
spark-submit error: Invalid maximum heap size: -Xmx4g –jars, but enough of memory on the system
I am running a spark job: And the command gives an error: Invalid maximum heap size: -Xmx4g –jars Error: Could not create the Java Virtual Machine. Error: A fatal exception has occurred. Program will exit. I checked memory: So, it seems to be fine. I checked java: Then I checked in Chrome whether spark is running at ai-grisnodedev1:7077 and it does
CompletableFuture runAsync vs supplyAsync, when to choose one over the other?
What is the rationale for choosing one over the other? Only difference I could infer after reading the documentation is that runAsync takes Runnable as an input parameter and supplyAsync takes Supplier as an input parameter. This stackoverflow post discusses the motivation behind using Supplier with supplyAsync method but it still does not answer when to prefer one over the
Java Error: java.lang.IllegalArgumentException: Comparison method violates its general contract
I am working on a old application which was originally written in Java 6 and which was upgraded to Java 7 a couple of years ago. In this application i am using a Collection.Sort to sort a list with a custom compare method by implementing Comparator interface. Type of objects in the list are CompanySchedule which have 3 properties companyName,
AbstractMethodError when creating JdkHttpServer for JAX-RS
I’m trying to create a Java server for a REST API and following this question I used jersey’s JdkHttpServer. I imported the necessary jars (from here), but when I start the server the following error appears: My code is the following: And in PokerResource I’ve got all the paths for the API. Am I missing some import or do I
Understanding Number of StreamProcessor instances created and do stream task share same streamprocessor instance?
I want to understand a little more details on the relationship between StreamThread, StreamTask and how many instances of StreamProcessor is created when we have: a source kafka topic with multiple partitions , say 6. I am keeping only ONE StreamThread (num.stream.threads=1) I am keeping a simple processor topology: source_topic –> Processor1 –> Processor2 –> Processo3 –> sink_topic Each processor
Can’t configure antMatchers after anyRequest (Multiple antMatcher)
I am trying to configure Spring Security and get this following error: Caused by: java.lang.IllegalStateException: Can’t configure antMatchers after anyRequest This is my SecurityConfig class: I already tried call httpSecurityauthorizeRequests().anyRequest().authenticated() as mentioned here, still didn’t work …any suggestion would be helpfull. Answer
react + spring boot upload file and form data
i have a case like in my form (front end), i can fill personal data (name, address, DOB) and then i can attach multiple image. In my spring boot controller : My model wrapper : Front end (React) Code : With above example, i always encounter errors. like : java.io.IOException: Stream closed and zero attachment length / zero attachment size