Tomcat – java.lang.InternalError: name is too long to represent

ByTomas Zezula March 23, 2014

I’ve got the aforementioned exception when I was trying to load a jsp page on Tomcat 6 running in a debug mode. Turns out the problem occurs when a jsp page grows big. It’s a known JVM issue described by bugs 39089 and 6294277. Here is how to solve it without touching the jsp.

Open conf/web.xml In your Tomcat install directory and add a supressSmap parameter to the jsp servlet:

<servlet>
 <servlet-name>jsp</servlet-name>
 <servlet-class>org.apache.jasper.servlet.JspServlet</servlet-class>
 ..
 <init-param>
  <param-name>suppressSmap</param-name>
  <param-value>true</param-value>
 </init-param>
 ..
</servlet>

SMAP stands for a source map generator (see Javadoc – SmapGenerator). Suppressing it will prevent the jsp be generated into the associated .class file. For full details, see JSR45 – Debugging Support for Other Languages.

Java | Spring

Spring series, part 6: Spring 4 and Generics-based Injection Matching

ByTomas Zezula April 3, 2014

Up until Spring 4 generics played no major role when it came to resolving injected bean dependencies. Suppose there are multiple beans of the same type implementing a generic interface. In a pre-Spring 4 world, any attempt to resolve such a bean by type would inevitably lead to a NonUniqueBeanDefinition exception, unless additional hints were…

Java | Tips & Tricks

Optimizing Eager Fetch with Spring Data and EntityGraph Annotation

ByTomas Zezula October 7, 2023October 19, 2023

The LazyInitializationException is a common occurrence when using Hibernate. It typically happens when you access a lazy-loaded association outside of the persistence context in which it was loaded. I will show you how to prevent this exception without compromising the performance of your application. Through the lens of Spring Data, I will explain how to resolve this challenge with a handy annotation: @EntityGraph. Implementing this strategy allows you to optimize both for efficiency and effectiveness, avoiding one of the common pitfalls in Hibernate.

Java

JEE Series: JSP and Integration Tests via HtmlUnit

ByTomas Zezula April 11, 2015

In the previous post we experimented with JavaServer Pages and created a simple web app. Lazy coders as we are can’t help, but automate as much as possible in order to avoid tedious manual steps. HtmlUnit is very well suited to work in tandem with JSP technology. I value the framework for its ease of…

Tips & Tricks

SSH Key Fingerprint

ByTomas Zezula March 7, 2012

I have recently received an email from GitHub asking me to confirm my SSH key. It took me a while to figure out how to generate the required fingerprint from the saved key file. Here is what needs to be done: ssh-keygen -lf .sshid_rsa.pub 2048 8d:f4:e7:95:76:b4:3d:5f:49:ec:49:79:50:8a:be:91 ..sshid_rsa.pub Credit goes to Chris.

Java | Test Automation | Tips & Tricks

JUnitParams – parameterized unit tests

ByTomas Zezula March 3, 2014

Less unit test code doesn’t necessarily result into poor coverage. I’ve recently entered the paradigm of parameterized tests when refactoring a larger test suite. I ended up writing significantly less code without compromising on the extent. In fact, adding a few corner cases was almost a no-brainer. In this post I’d like to share my…

Java

Count characters in a piece of text as a one-liner using Java 8 Streaming API

ByTomas Zezula October 2, 2015

A WordCount app is arguably the most commonly used example of the MapReduce principle – see Hadoop or Spark tutorials. I wanted to do a similar thing in plain old Java as “a one-liner” (kind of). My objective was to explore the power and expressiveness of the Streaming API and Lambda expressions. Here is what I wanted to achieve: Input:…

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