Stop Scrolling Through Endless Spring Boot Logs

Paste your Spring Boot stack trace and instantly get the root cause exception with key frames. Built for Java developers, DevOps engineers, and SREs who need to diagnose production errors fast—without manually digging through thousands of log lines.

Results update live as you type — no button needed. The Example button fills a sample input.

Why use Spring Boot Root Cause Extractor?

Instantly identifies the root cause exception from nested Spring exceptions

Extracts exception type, message, and critical stack frames

Handles verbose Spring Boot logs with multiple nested exceptions

Works with pasted text or uploaded log files

No sign-up, no data storage—runs entirely in your browser

FAQ

What is a root cause exception in Spring Boot?

In Spring Boot, exceptions are often wrapped in multiple layers (e.g., BeanCreationException wrapping NoSuchBeanDefinitionException). The root cause is the innermost exception that actually triggered the failure, such as NoSuchBeanDefinitionException.

How does this tool handle nested exceptions?

It parses the log to find the deepest 'Caused by' or 'nested exception is' chain and extracts the final exception type and message, along with the most relevant stack frames.

Is my log data sent to a server?

No. All processing happens locally in your browser. Your logs never leave your device.

Can I use this for other Java frameworks?

Yes, while optimized for Spring Boot, it works with any Java stack trace that follows standard exception chaining patterns.

Example input

Try it with this sample — paste it into the box above:

2024-01-15 10:23:45.123 ERROR 12345 --- [nio-8080-exec-1] o.s.b.w.s.c.AnnotationConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userService': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.example.repository.UserRepository com.example.service.UserService.userRepository; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.example.repository.UserRepository' available
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:643)
	at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:130)
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1420)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:602)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:531)
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:944)
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:918)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583)
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:144)
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:782)
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:771)
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:422)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:337)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1306)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1295)
	at com.example.Application.main(Application.java:10)

How to use Spring Boot Root Cause Extractor

  1. Enter or paste your data into the Paste your Spring Boot log or stack trace box above.
  2. The result appears instantly in the Extracted Root Cause box — everything runs in your browser, nothing is uploaded.
  3. Use Copy or Download to keep the result, or Example to load a sample first.

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