Gradle configuration cache fails: nested config POJOs are not Serializable

[JoelMagee]

Problem
In typescript-generator-gradle-plugin 4.x, the nested-POJO types used by @Input Property<T> fields on TypescriptGeneratorExtension do not implement java.io.Serializable. Setting any of them to a non-default value breaks Gradle's configuration cache with:

Cannot fingerprint input property 'jackson3Configuration':
    value 'cz.habarta.typescript.generator.Jackson3Configuration@...' cannot be serialized.

Affected Types
All six nested-POJO input types are non-Serializable (verified by reflection at configuration time):

• Jackson2Configuration
• Jackson3Configuration
• GsonConfiguration
• JsonbConfiguration
• ModuleDependency (element of moduleDependencies)
• Settings.ConfiguredExtension (element of extensionsWithConfigurations)

Environment
Plugin 4.1.1, Gradle 8.14.5, JDK 21

[pkubowicz]

You can change the title to something like 'Gradle fails when using nested config POJOS'.

Meaning the plugin is not usable if you try to configure it using POJOs.

It's because the problem is not with Configuration Cache (which can be disabled). It's in the core feature of Gradle where it checks if tasks are 'up to date':

Caused by: org.gradle.internal.snapshot.ValueSnapshottingException: Could not serialize value of type Jackson3Configuration
        at org.gradle.internal.snapshot.impl.AbstractValueProcessor.newValueSerializationException(AbstractValueProcessor.java:223)
        at org.gradle.internal.snapshot.impl.AbstractValueProcessor.javaSerialized(AbstractValueProcessor.java:214)
        at org.gradle.internal.snapshot.impl.AbstractValueProcessor.javaSerialization(AbstractValueProcessor.java:205)
        at org.gradle.internal.snapshot.impl.AbstractValueProcessor.processValue(AbstractValueProcessor.java:119)
        at org.gradle.internal.snapshot.impl.DefaultValueSnapshotter.snapshot(DefaultValueSnapshotter.java:47)
        at org.gradle.internal.execution.impl.DefaultInputFingerprinter$InputCollectingVisitor.visitInputProperty(DefaultInputFingerprinter.java:107)
        ... 68 more
Caused by: java.io.NotSerializableException: cz.habarta.typescript.generator.Jackson3Configuration
        at org.gradle.internal.snapshot.impl.AbstractValueProcessor.javaSerialized(AbstractValueProcessor.java:211)
        ... 72 more

Reproduction

Go to https://github.com/vojtechhabarta/typescript-generator/tree/main/sample-gradle

Try to use a POJO:

diff --git a/sample-gradle/build.gradle b/sample-gradle/build.gradle
index 104da26..c9af497 100644
--- a/sample-gradle/build.gradle
+++ b/sample-gradle/build.gradle
@@ -1,4 +1,5 @@
 import cz.habarta.typescript.generator.JsonLibrary
+import cz.habarta.typescript.generator.Jackson3Configuration
 import cz.habarta.typescript.generator.TypeScriptOutputKind
 
 buildscript {
@@ -49,6 +50,7 @@ generateTypeScript {
         'cz.habarta.typescript.generator.sample.PersonScala',
     ]
     jsonLibrary = JsonLibrary.jackson3
+    jackson3Configuration = new Jackson3Configuration()
     outputKind = TypeScriptOutputKind.module
     excludeClasses = [
         'groovy.lang.GroovyObject',

Run ./gradlew --no-configuration-cache --no-build-cache --stacktrace generateType (uses Gradle 8.14.4, but I also executed a local instance of Gradle 9.6.1 with the same effect).

Result: the error message you reported originally + the stacktrace I pasted above