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jvm Key Features
jvm Examples and Code Snippets
// Since 8.1.0 the drawer includes core ktx 1.3.0 which requires jvm 1.8
kotlinOptions {
jvmTarget = "1.8"
}
private static void writePID() {
SpringApplicationBuilder app = new SpringApplicationBuilder(Application.class).web(WebApplicationType.NONE);
app.build().addListeners(new ApplicationPidFileWriter("./bin/shutdown.pid"));
app.ru
@Bean
JvmThreadMetrics threadMetrics() {
return new JvmThreadMetrics();
}
public static void shutdown() {
// Close caches and connection pools
getSessionFactory().close();
}
Community Discussions
Trending Discussions on jvm
QUESTION
When I double click the same item or if I go to each composable screen very quickly i receive an error, How do I solve this problem? I tried changing few things but I just can't solve it and I can't find any resources to fix this problem.
Bottom Navigation implementation
...ANSWER
Answered 2022-Mar-06 at 09:39I'm facing the same problem using the latest compose navigation dependency 2.5.0-alpha03
.
I don't know why it's happening.
Philip Dukhov is right, you should report this issue.
Here is a dirty workaround :
QUESTION
I have newly installed
...ANSWER
Answered 2021-Jul-28 at 07:22You are running the project via Java 1.8 and add the --add-opens
option to the runner. However Java 1.8 does not support it.
So, the first option is to use Java 11 to run the project, as Java 11 can recognize this VM option.
Another solution is to find a place where --add-opens
is added and remove it.
Check Run configuration in IntelliJ IDEA (VM options field) and Maven/Gradle configuration files for argLine
(Maven) and jvmArgs
(Gradle)
QUESTION
I'm trying to initiate a Springboot project using Open Jdk 15, Springboot 2.6.0, Springfox 3. We are working on a project that replaced Netty as the webserver and used Jetty instead because we do not need a non-blocking environment.
In the code we depend primarily on Reactor API (Flux, Mono), so we can not remove org.springframework.boot:spring-boot-starter-webflux
dependencies.
I replicated the problem that we have in a new project.: https://github.com/jvacaq/spring-fox.
I figured out that these lines in our build.gradle file are the origin of the problem.
...ANSWER
Answered 2022-Feb-08 at 12:36This problem's caused by a bug in Springfox. It's making an assumption about how Spring MVC is set up that doesn't always hold true. Specifically, it's assuming that MVC's path matching will use the Ant-based path matcher and not the PathPattern-based matcher. PathPattern-based matching has been an option for some time now and is the default as of Spring Boot 2.6.
As described in Spring Boot 2.6's release notes, you can restore the configuration that Springfox assumes will be used by setting spring.mvc.pathmatch.matching-strategy
to ant-path-matcher
in your application.properties
file. Note that this will only work if you are not using Spring Boot's Actuator. The Actuator always uses PathPattern-based parsing, irrespective of the configured matching-strategy
. A change to Springfox will be required if you want to use it with the Actuator in Spring Boot 2.6 and later.
QUESTION
My apk is failing to compile saying it could not get
Plugin [id: 'org.jetbrains.kotlin.jvm', version: '1.4.21'] was not found in any of the following sources:
When I try to visit: https://dl.bintray.com/kotlin/kotlin-eap I get a 502 bad gateway
is this the reason why it's failing to build?
my gradle:
...ANSWER
Answered 2021-Dec-14 at 02:15Bintray
and JCenter
is not supported yet
Remove all Bintray
and JCenter
repository configure in your gradle
file. And use mavenCentral()
instead.
Here is the solution:
QUESTION
I have error like this after trying to build my apps in Emulator
/Users/joel/.gradle/caches/transforms-3/06231cc1265260b25a06bafce7a4176f/transformed/core-1.7.0-alpha02/res/values/values.xml:105:5-114:25: AAPT: error: resource android:attr/lStar not found.
I don't know what causes this error. After digging some answer which has similarly error (but in flutter) Problem. But still not solved my issue.
I have this dependency in my project
...ANSWER
Answered 2021-Sep-28 at 17:18I managed to fix this by upgrading compileSdk to 31 and kotlin gradle plugin to 1.5.10
QUESTION
I have quite a few projects that is slowly being migrated from Java to Kotlin, but I'm facing a problem when changing from Java POJO to Kotlin data classes. Bean validation stops working in REST controllers. I have created a very simple project directly from https://start.spring.io to demonstrate the failure.
...ANSWER
Answered 2021-Dec-16 at 07:38I think you are just missing @Validated annotation on top of your controller class.
QUESTION
private fun getReferralId() {
Firebase.dynamicLinks
.getDynamicLink(intent)
.addOnSuccessListener(this) { pendingDynamicLinkData ->
pendingDynamicLinkData?.link?.getQueryParameter(
DEEP_LINK_QUERY_PARAM_REFERRAL_ID
)?.let { refId ->
viewModel.saveReferralId(refId)
}
}
}
...ANSWER
Answered 2021-Dec-17 at 17:18it's a bug in the library due to a play services update. To fix it, you should explicitly declare that the pendingDynamicLinkData
is nullable.
Like this:
QUESTION
We have a bunch of microservices based on Spring Boot 2.5.4 also including spring-kafka:2.7.6
and spring-boot-actuator:2.5.4
. All the services use Tomcat as servlet container and graceful shutdown enabled. These microservices are containerized using docker.
Due to a misconfiguration, yesterday we faced a problem on one of these containers because it took a port already bound from another one.
Log states:
ANSWER
Answered 2021-Dec-17 at 08:38Since you have everything containerized, it's way simpler.
Just set up a small healthcheck endpoint with Spring Web which serves to see if the server is still running, something like:
QUESTION
I found a source describing that the default gc used changes depending on the available resources. It seems that the jvm uses either g1gc or serial gc dependnig on hardware and os.
The serial collector is selected by default on certain hardware and operating system configurations
Can someone point out a more detailed source on what the specific criteria is and how that would apply in a dockerized/kubernetes enivronment. In other words:
Could setting resource requests of the pod in k8s to eg. 1500 mCpu make the jvm use serial gc and changing to 2 Cpu change the default gc to g1gc? Do the limits on when which gc is used change depending on jvm version (11 vs 17)?
...ANSWER
Answered 2022-Jan-11 at 10:24In JDK 11 and 17 Serial
collector is used when there is only one CPU available. Otherwise G1
is selected
If you limit the number of CPUS available to your container, JVM selects Serial
instead of the defaultG1
QUESTION
As the title states:
Is there any difference between String.getOrElse()
and String.elementAtOrElse()
? From a functional point of view they seem completely identical, maybe some performance difference?
Same question accounts to String.getOrNull()
and String.elementAtOrNull()
.
ANSWER
Answered 2021-Dec-02 at 06:12The very links you included in your question allow you to see the source code of each implementation which tells you that, no, there is no difference.
In fact elementAtOrNull
literally just calls getOrNull
.
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
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Install jvm
You can use jvm like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the jvm component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .
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