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Baeldung Pro comes with both absolutely No-Ads as well as finally with Dark Mode, for a clean learning experience:

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Once the early-adopter seats are all used, the price will go up and stay at $33/year.

Partner – Microsoft – NPI EA (cat = Baeldung)
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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.

Partner – Microsoft – NPI EA (cat= Spring Boot)
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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.

Partner – Orkes – NPI EA (cat=Spring)
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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.

Try a 14-Day Free Trial of Orkes Conductor today.

Partner – Orkes – NPI EA (tag=Microservices)
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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.

Try a 14-Day Free Trial of Orkes Conductor today.

eBook – Guide Spring Cloud – NPI EA (cat=Spring Cloud)
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eBook – Mockito – NPI EA (tag = Mockito)
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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:

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eBook – Java Concurrency – NPI EA (cat=Java Concurrency)
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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.

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eBook – Reactive – NPI EA (cat=Reactive)
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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:

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eBook – Java Streams – NPI EA (cat=Java Streams)
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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:

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eBook – Jackson – NPI EA (cat=Jackson)
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Do JSON right with Jackson

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eBook – HTTP Client – NPI EA (cat=Http Client-Side)
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Get the most out of the Apache HTTP Client

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Get Started with Apache Maven:

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eBook – Persistence – NPI EA (cat=Persistence)
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eBook – RwS – NPI EA (cat=Spring MVC)
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Building a REST API with Spring?

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Course – LS – NPI EA (cat=Jackson)
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Get started with Spring and Spring Boot, through the Learn Spring course:

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Course – RWSB – NPI EA (cat=REST)
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Explore Spring Boot 3 and Spring 6 in-depth through building a full REST API with the framework:

>> The New “REST With Spring Boot”

Course – LSS – NPI EA (cat=Spring Security)
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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:

>> Learn Spring Security

Course – All Access – NPI EA (cat= Spring)
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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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Course – LSD – NPI EA (tag=Spring Data JPA)
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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:

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Partner – LambdaTest – NPI EA (cat=Testing)
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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:

>> Automated End-to-End Testing With Playwright

Course – Spring Sale 2025 – NPI EA (cat= Baeldung)
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Course – Spring Sale 2025 – NPI (cat=Baeldung)
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Yes, we're now running our Spring Sale. All Courses are 25% off until 26th May, 2025:

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1. Overview

The H2 console serves as a Graphical User Interface (GUI) client for the H2 database, allowing us to query the database through a web page. However, we may encounter an issue where the console displays a blank page, particularly when a Spring Security dependency is present in our classpath.

In this tutorial, we’ll simulate this issue and learn how to resolve it by configuring the X-Frame-Options header in Spring Security.

2. Understanding and Simulating the Error

The H2 database helps with fast prototyping as it shares the attributes of most production-grade SQL servers. However, when using the H2 database with Spring Security, access to the H2 console in the browser is automatically restricted.

This occurs because the H2 console is rendered within an <iframe>, which Spring Security disables by default to prevent cyberattacks such as clickjacking.

In clickjacking, a malicious website embeds or overlays a target website under clickable elements such as frames or buttons, deceiving users into interacting with malicious content. Secure websites implement configurations to prevent content from being rendered in frames.

Let’s simulate this error by setting up a simple Spring Boot project with a Spring Security dependency.

2.1. Maven Dependencies

First, let’s add the spring-boot-starter-web and spring-boot-starter-security dependencies to the pom.xml file:

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
    <version>3.4.4</version>
</dependency>

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-security</artifactId>
    <version>3.4.4</version>
</dependency>

The spring-boot-starter-web dependency, with an embedded server, enables us to create a web application.

Also, the spring-boot-starter-security dependency helps to authenticate and authorize endpoints in a typical Spring Boot application. When no custom user details are defined, it generates login credentials by default at application startup:

  • Username – user
  • Password – A random value printed in the console

Next, let’s add the H2 database dependency to pom.xml:

<dependency>
    <groupId>com.h2database</groupId>
    <artifactId>h2</artifactId>
    <version>2.3.232</version>
</dependency>

The H2 dependency provides an embedded database ideal for rapid prototyping.

2.2. Database Configuration

Moving on, let’s configure the database connection in the application.properties file:

spring.datasource.url=jdbc:h2:mem:testdb
spring.datasource.driverClassName=org.h2.Driver
spring.datasource.username=sa
spring.datasource.password=password
spring.jpa.database-platform=org.hibernate.dialect.H2Dialect
spring.h2.console.enabled=true

Although Spring Boot automatically configures the database, we define our configuration to override the default for greater control.

By default, the spring.h2.console.enable property is false. We set it to true to enable the H2 web console.

2.3. Viewing the Console

With Spring Security enabled, all endpoints, including “/h2-console/**“, require authentication by default. However, let’s define a class named SecurityConfig for custom configuration:

@Configuration
class SecurityConfig {
    @Bean
    SecurityFilterChain configure(HttpSecurity http) throws Exception {
        http.csrf(csrf -> csrf.ignoringRequestMatchers("/h2-console/**"))
          .authorizeHttpRequests(auth -> auth
            .anyRequest().authenticated())
          .formLogin(withDefaults());

        return http.build();
    }
}

In the configuration above, we maintain the default authentication and form login behavior but disable CSRF protection for “/h2-console/**” to avoid an HTTP 403 error.

Next, let’s execute our application and check http://localhost:8080/h2-console. It redirects us to Spring Security’s login page, where we use the default generated credentials.

After logging in, we’re redirected to the H2 console’s database login page:

h2 database console login page

However, when we try to log in, we get a blank page:

h2 console blank page

This error is caused because the H2 console is rendered using the <iframe> tag, which Spring Security blocks by default through the X-Frame-Options header.

3. Fixing the Error by Disabling X-Frame-Options

The page fails to load the important component after signing in to the console. We can resolve this by either disabling the X-Frame-Options header or allowing frames only from the same origin.

3.1. Globally Disabling Frame Protection With frameOptions()

If the application isn’t intended for production use, we can disable X-Frame-Options using frameOptions():

@Bean
SecurityFilterChain configure(HttpSecurity http) throws Exception {
    http.csrf(csrf -> csrf.ignoringRequestMatchers("/h2-console/**"))
      .headers(headers -> headers.frameOptions(HeadersConfigurer.FrameOptionsConfig::disable))
      .authorizeHttpRequests(auth -> auth
        .anyRequest().authenticated())
      .formLogin(withDefaults());

    return http.build();
}

Here, we use the headers() method on the http instance to allow frames to load.

Let’s see the page now:

h2 database console render without error when frame rendering is allowed

 

This method solves the problem, but it disables X-Frame-Options at a global level.

3.2. Configuring Frame Options for Same-Origin Access

While the previous solution works, disabling the X-Frame-Options header globally isn’t ideal because it exposes the application to a potential clickjacking attack. Instead, we can allow frames only from the same origin:

@Bean
SecurityFilterChain configure(HttpSecurity http) throws Exception {
    http.csrf(csrf -> csrf.ignoringRequestMatchers("/h2-console/**"))
      .headers(headers -> headers.frameOptions(HeadersConfigurer.FrameOptionsConfig::sameOrigin))
      .authorizeHttpRequests(auth -> auth
        .anyRequest().authenticated())
      .formLogin(withDefaults());

    return http.build();
}

Here, we change the frameOptions() to permit only the same-origin application.

Adjusting security configurations like this, to allow framing only within the same origin, reduces the risk of clickjacking.

4. Conclusion

In this article, we simulated the blank page error when accessing the H2 console in a browser and resolved it by configuring the frameOptions() setting in Spring Security. Also, we saw how to disable the X-Frame-Options globally for development and restrict it to the same origin for better security.

As always, the complete source code for the examples is available over on GitHub.

Baeldung Pro – NPI EA (cat = Baeldung)
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Baeldung Pro comes with both absolutely No-Ads as well as finally with Dark Mode, for a clean learning experience:

>> Explore a clean Baeldung

Once the early-adopter seats are all used, the price will go up and stay at $33/year.

Partner – Microsoft – NPI EA (cat = Spring Boot)
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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.

Partner – Orkes – NPI EA (cat = Spring)
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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.

Try a 14-Day Free Trial of Orkes Conductor today.

Partner – Orkes – NPI EA (tag = Microservices)
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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.

Try a 14-Day Free Trial of Orkes Conductor today.

eBook – HTTP Client – NPI EA (cat=HTTP Client-Side)
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The Apache HTTP Client is a very robust library, suitable for both simple and advanced use cases when testing HTTP endpoints. Check out our guide covering basic request and response handling, as well as security, cookies, timeouts, and more:

>> Download the eBook

eBook – Java Concurrency – NPI EA (cat=Java Concurrency)
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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:

>> Download the eBook

eBook – Java Streams – NPI EA (cat=Java Streams)
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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:

>> Join Pro and download the eBook

eBook – Persistence – NPI EA (cat=Persistence)
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Working on getting your persistence layer right with Spring?

Explore the eBook

Course – LS – NPI EA (cat=REST)

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Get started with Spring Boot and with core Spring, through the Learn Spring course:

>> CHECK OUT THE COURSE

Course – Spring Sale 2025 – NPI EA (cat= Baeldung)
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Yes, we're now running our Spring Sale. All Courses are 25% off until 26th May, 2025:

>> EXPLORE ACCESS NOW

Course – Spring Sale 2025 – NPI (All)
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Yes, we're now running our Spring Sale. All Courses are 25% off until 26th May, 2025:

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Partner – Microsoft – NPI (cat=Spring)
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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.

eBook Jackson – NPI EA – 3 (cat = Jackson)
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