Re: GWT Dev Conflict with Spring Boot 3.4 and Google GSON

Awesome!  Thanks Colin and Ahmad!

> That said... you should not have gwt-dev on the same classpath as your server, and you should not remove gson from gwt-dev, or you may have compilation issues with sourcemaps.

Apologies, it isn't.  I was incorrect when I sait it could be removed.  I removed it, started the code server, and everything looked good.  It wasn't until after I posted my message, I realised the code server couldn't compile the JS without it.

> The tweak you're making is totally acceptable to make to gwt-servlet (or gwt-servlet-jakarta) though - either exclude if you don't use the stack trace deobfuscator with sourcemaps, or just update to 2.11.0.

Excellent.  Thanks again.  :)

On Thursday, 9 January 2025 at 1:36:33 pm UTC+11 Colin Alworth wrote:

Update the GSON version as you're doing - Ahmad is in the process of making this change in GWT itself:

https://github.com/gwtproject/gwt/pull/10079

https://github.com/gwtproject/tools/pull/34

In the next GWT release, we'll default to using 2.11.0.

That said... you should not have gwt-dev on the same classpath as your server, and you should not remove gson from gwt-dev, or you may have compilation issues with sourcemaps.

The tweak you're making is totally acceptable to make to gwt-servlet (or gwt-servlet-jakarta) though - either exclude if you don't use the stack trace deobfuscator with sourcemaps, or just update to 2.11.0.

On Wednesday, January 8, 2025 at 8:28:39 PM UTC-6 ma...@craig-mitchell.com wrote:

When upgrading from Spring Boot 3.3 to 3.4, my app still compiles, but when I run it, crashes with:

Error starting ApplicationContext. To display the condition evaluation report re-run your application with 'debug' enabled.
[2025-01-09 12:36:47.028] - 13568 SEVERE [restartedMain] --- org.springframework.boot.SpringApplication: Application run failed
java.lang.NoClassDefFoundError: com/google/gson/Strictness

Others have reported the same issue, but with different causes:  https://github.com/spring-projects/spring-boot/issues/43442

When I look at who is using GSON, it's gwt-dev.jar:

[INFO] teamdrift:drift-team-client:gwt-app:1.0-SNAPSHOT
[INFO] +- org.gwtproject:gwt-dev:jar:2.12.1:compile
[INFO] |  +- com.google.code.gson:gson:jar:2.6.2:compile

I can fix it by adding the newer version to my server:

<dependency>
  <groupId>com.google.code.gson</groupId>
  <artifactId>gson</artifactId>
  <version>2.11.0</version>
</dependency>

And optionally, to clean up so the old version, remove it from my client gwt-dev:

<dependency>
  <groupId>org.gwtproject</groupId>
  <artifactId>gwt-dev</artifactId>
  <exclusions>
    <exclusion>
      <groupId>com.google.code.gson</groupId>
      <artifactId>gson</artifactId>
    </exclusion>
  </exclusions>
</dependency>

Is this the best fix?  Or is there something better?

Thanks.

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