@PostConstruct throwing errors
Regards, Karthik A Bhat
Dave Tolls wrote: Can you show the relevant bit of code, and the import statement at the top of the code?
Stephan van Hulst wrote: You haven't imported the annotation yet. You need to import javax.annotation.PostConstruct .
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Java – import javax.annotation.* cannot be resolved in Eclipse’s Java 10 Compiler
eclipse java spring spring-mvc
In my machine (Windows 10), there are two versions of Java, Java 1.8 (JRE and JDK) and Java 10 (JRE and JDK).
Previously IF I set my Eclipse to:
- Java Compiler (JDK Complience) : 1.8
- Java Build Path (JRE System Libraries) : 1.8
THEN IF i use following Spring code
Everything works fine . No error at all.
However , IF I set my Eclipse to:
- Java Compiler (JDK Complience) : 10
- Java Build Path (JRE System Libraries) : 10
Now, the import statement is throwing an Error message:
and this error also happen on @PreDestroy annotation too.
Why is this happening? What happen to Java 10? How to solve this problem if i still want to retain Java Compiler and JRE System Libraries version to Java 10?
You can try to add annotation dependencies to pom.xml, so that they would be available for Spring:
Java – is java “pass-by-reference” or “pass-by-value”.
Java is always pass-by-value . Unfortunately, when we deal with objects we are really dealing with object-handles called references which are passed-by-value as well. This terminology and semantics easily confuse many beginners.
It goes like this:
In the example above aDog.getName() will still return "Max" . The value aDog within main is not changed in the function foo with the Dog "Fifi" as the object reference is passed by value. If it were passed by reference, then the aDog.getName() in main would return "Fifi" after the call to foo .
In the above example, Fifi is the dog's name after call to foo(aDog) because the object's name was set inside of foo(...) . Any operations that foo performs on d are such that, for all practical purposes, they are performed on aDog , but it is not possible to change the value of the variable aDog itself.
For more information on pass by reference and pass by value, consult the following SO answer: https://stackoverflow.com/a/430958/6005228 . This explains more thoroughly the semantics and history behind the two and also explains why Java and many other modern languages appear to do both in certain cases.
Java – How to get an enum value from a string value in Java
Yes, Blah.valueOf("A") will give you Blah.A .
Note that the name must be an exact match, including case: Blah.valueOf("a") and Blah.valueOf("A ") both throw an IllegalArgumentException .
The static methods valueOf() and values() are created at compile time and do not appear in source code. They do appear in Javadoc, though; for example, Dialog.ModalityType shows both methods.
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[Solved]-import javax.annotation.* cannot be resolved in Eclipse's Java 10 Compiler-eclipse
you can add the interfaces initializingbean and disposablebean to your class. then you can use the methods:afterpropertiesset() and destroy() .
@predestroy and @postconstruct are from
after importing these two libraries in eclipse if eclipse can not recognize them then you have to add a jar.
add it to your project.
and add it to reference libraries .
to add jar, goto project properties >> java build path >> libraries >> add jars
this worked for me when i ran into this type of issue. i added this to my pom.xml
if you are using gradle, you can add this this line to the dependencies:
this is an example of the dependencies that i am using in one project:
this should solve the question's problem on java 10 up to java 17.
add javax.annotation-api-1.3.2.jar to your classpath. it works with jdk 10 as well. for more clarity on alternative approaches, go through below video link:
missing javax annotation
jar or dependency can be found here.
well this happens because @postconstruct and @predestroy are deprecated in java 9 onwards so better not to use them instead use interface to resolve this
you would need to point the eclipse to java 8 via window -->preferences-->java and add jdk 1.8 bin path. once done, project will be built automatically and issue should be resolved.
you can try to add annotation dependencies to pom.xml, so that they would be available for spring:
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The import javax.annotation.PostConstruct cannot be resolved?
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Alguém saberia me informar porque o PostConstruct ao é reconhecido pelo Eclipse?
Se você tiver usando Spring Boot tenta adicionar essa dependência no seu pom.xml:
Caso não esteja usando, use essa:
Vê se ele reconhece, aguardo seu retorno!
Resolvi utilizando a primeira dependência.
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@PostConstruct (javax.annotation) is missing with JDK 11 & <5.7
- Status: Resolved
- Resolution: Fixed
- Affects Version/s: 5.6.4
- Fix Version/s: 5.6.5
- Component/s: tapestry-ioc
- Labels: None
It looks like a
is missing for < 5.7 in ioc build.gradle, but I have to make sure the error isn't on my side.
Usually the dependency (or an equivalent) is pulled by other dependencies, but I started a new ioc/core non-web-app with minimal dependencies, and it crashes on startup: