Baeldung Pro comes with both absolutely No-Ads as well as finally with Dark Mode, for a clean learning experience:
Once the early-adopter seats are all used, the price will go up and stay at $33/year.
Azure Container Apps is a fully managed serverless container service that enables you to build and deploy modern, cloud-native Java applications and microservices at scale. It offers a simplified developer experience while providing the flexibility and portability of containers.
Of course, Azure Container Apps has really solid support for our ecosystem, from a number of build options, managed Java components, native metrics, dynamic logger, and quite a bit more.
To learn more about Java features on Azure Container Apps, visit the documentation page.
You can also ask questions and leave feedback on the Azure Container Apps GitHub page.
Azure Container Apps is a fully managed serverless container service that enables you to build and deploy modern, cloud-native Java applications and microservices at scale. It offers a simplified developer experience while providing the flexibility and portability of containers.
Of course, Azure Container Apps has really solid support for our ecosystem, from a number of build options, managed Java components, native metrics, dynamic logger, and quite a bit more.
To learn more about Java features on Azure Container Apps, you can get started over on the documentation page.
And, you can also ask questions and leave feedback on the Azure Container Apps GitHub page.
Modern software architecture is often broken. Slow delivery leads to missed opportunities, innovation is stalled due to architectural complexities, and engineering resources are exceedingly expensive.
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Modern software architecture is often broken. Slow delivery leads to missed opportunities, innovation is stalled due to architectural complexities, and engineering resources are exceedingly expensive.
Orkes is the leading workflow orchestration platform built to enable teams to transform the way they develop, connect, and deploy applications, microservices, AI agents, and more.
With Orkes Conductor managed through Orkes Cloud, developers can focus on building mission critical applications without worrying about infrastructure maintenance to meet goals and, simply put, taking new products live faster and reducing total cost of ownership.
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Mocking is an essential part of unit testing, and the Mockito library makes it easy to write clean and intuitive unit tests for your Java code.
Get started with mocking and improve your application tests using our Mockito guide:
Handling concurrency in an application can be a tricky process with many potential pitfalls. A solid grasp of the fundamentals will go a long way to help minimize these issues.
Get started with understanding multi-threaded applications with our Java Concurrency guide:
Spring 5 added support for reactive programming with the Spring WebFlux module, which has been improved upon ever since. Get started with the Reactor project basics and reactive programming in Spring Boot:
Since its introduction in Java 8, the Stream API has become a staple of Java development. The basic operations like iterating, filtering, mapping sequences of elements are deceptively simple to use.
But these can also be overused and fall into some common pitfalls.
To get a better understanding on how Streams work and how to combine them with other language features, check out our guide to Java Streams:
Explore Spring Boot 3 and Spring 6 in-depth through building a full REST API with the framework:
Yes, Spring Security can be complex, from the more advanced functionality within the Core to the deep OAuth support in the framework.
I built the security material as two full courses - Core and OAuth, to get practical with these more complex scenarios. We explore when and how to use each feature and code through it on the backing project.
You can explore the course here:
All Access is finally out, with all of my Spring courses. Learn JUnit is out as well, and Learn Maven is coming fast. And, of course, quite a bit more affordable. Finally.
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Spring Data JPA is a great way to handle the complexity of JPA with the powerful simplicity of Spring Boot.
Get started with Spring Data JPA through the guided reference course:
End-to-end testing is a very useful method to make sure that your application works as intended. This highlights issues in the overall functionality of the software, that the unit and integration test stages may miss.
Playwright is an easy-to-use, but powerful tool that automates end-to-end testing, and supports all modern browsers and platforms.
When coupled with LambdaTest (an AI-powered cloud-based test execution platform) it can be further scaled to run the Playwright scripts in parallel across 3000+ browser and device combinations:
Yes, we're now running our Spring Sale. All Courses are 25% off until 26th May, 2025:
Yes, we're now running our Spring Sale. All Courses are 25% off until 26th May, 2025:
1. Overview
It’s common practice to monitor Java applications for performance and stability. Spring Boot provides this monitoring capability via Actuators. However, we may need more fine-grained control or a lightweight way to achieve the same.
Jolokia helps us monitor the application via API endpoints and provides features like bulk operations and security mechanisms at the same time.
In this tutorial, we’ll look at integrating Jolokia into a Spring Boot application.
2. Setup
We’ll now look at the steps needed to enable Jolokia in our application.
2.1. Dependency
To begin with, we need to add the Jolokia dependency to use Jolokia which adds the transitive dependencies and service libraries:
<dependency>
<groupId>org.jolokia</groupId>
<artifactId>jolokia-support-spring</artifactId>
<version>2.2.1</version>
</dependency>2.2. Enabling Jolokia
By default, Spring Boot Actuator only exposes limited endpoints. To enable Jolokia, we need to configure it, in the application’s properties file:
management.endpoints.web.exposure.include=jolokiaNow, with the dependencies added and the application configured, Jolokia will be accessible when we start the Spring Boot application.
3. Accessing Jolokia
Jolokia provides several commands for a variety of tasks:
- read: Reading MBean attributes
- write: Setting MBean attributes
- exec: Executing an operation on MBean
- list: Listing available MBeans along with their attributes and operations
- search: Searching for MBeans
- version: Version and server information
- notification: Subscribing to and receiving notifications
Next, let’s look at some of these commands.
3.1. version Command
Let’s navigate to the following endpoint:
http://localhost:8080/actuator/jolokia/versionWe should get the following response:
As we can see, we get some information about the version, such as whether it’s secured, whether there’s a proxy, etc.
3.2. list Command
Now, let’s get a list of all the available MBeans by executing the list command:
http://localhost:8080/actuator/jolokia/listWe can see the list of available beans, along with the allowed operations on each of them:
3.3. read Command
We’ll try to get information about the Heap Memory usage, using the read command:
http://localhost:8080/actuator/jolokia/read/java.lang:type=Memory/HeapMemoryUsageAs we can observe in the response, the different values for the HeapMemoryUsage attribute are visible:
3.4. exec Command
Let’s initiate garbage collection by executing an exec command:
http://localhost:8080/actuator/jolokia/exec/java.lang:type=Memory/gcWe received a 200 status code, meaning the garbage collection command was accepted:
Getting information or initiating action on any of the exposed MBeans is easy. However, we’ll need to ensure that only expected operations can be performed by a limited number of people with access.
4. Securing Jolokia
As we’ve observed, Jolokia exposes all the JMX resources by default. This can certainly pose a problem since all users are allowed all the operations which may compromise the application. To avoid this situation, we need to secure the endpoints.
4.1. Disabling Jolokia Endpoints
On Production servers, we could completely disable Jolokia by setting the following in the application properties:
management.endpoint.jolokia.enabled=false4.2. Restricting Access With Security Rules
We could configure the security rules by creating a jolokia-access.xml file and placing it in the classpath.
Let’s create one so that Jolokia access is secured by the IP address of the user:
<restrict>
<remote>
<host>127.0.0.1</host>
</remote>
</restrict>And when we try to access the Jolokia endpoint, we get an error as expected:
Next, we’ll try to restrict certain commands or operations. For example, we’ll only allow the read and list commands:
<commands>
<command>read</command>
<command>list</command>
</commands>Now, let’s try to POST the exec command for garbage collection we tried earlier:
As we can see since we only allowed the read and list operations, the exec command is forbidden.
Finally, we can also allow or deny certain MBean operations that override even the entries in the commands section.
<allow>
<mbean>
<name>java.lang:type=Memory</name>
<operation>gc</operation>
</mbean>
</allow>
<deny>
<mbean>
<name>jdk.management.jfr:type=FlightRecorder</name>
<attribute>*</attribute>
<operation>*</operation>
</mbean>
</deny>We’ve allowed the gc operation on the Memory MBean. Also, in the deny section, we’ve denied all attributes and operations on the FlightRecorder MBean.
5. Conclusion
In this article, we learned how to integrate Jolokia with Spring Boot. First, we took a look at the initial setup and some basic commands.
Next, we explored how can we secure the access and operations on various MBeans, namely by restrictions on IP addresses, whitelisting commands, and allowing or denying certain MBeans and their attributes/operations.
The code backing this article is available on GitHub. Once you're logged in as a Baeldung Pro Member, start learning and coding on the project.
