IGNITE-28073 : Examples fail with IllegalStateException when run directly - deploymentUnitJar not built

[ashishm07]

Running any example that requires a deployment unit directly via Gradle fails with:

java.lang.IllegalStateException: Deployment unit JAR not found at: .../examples/java/build/libs/deploymentunit-example-1.0.0.jar

Root Cause:

deploymentUnitJar was only wired into the build lifecycle. Direct class execution via Gradle uses a JavaExec task that only depends on classes, bypassing deploymentUnitJar. As a result, the JAR is never built unless ./gradlew :ignite-examples:build is run explicitly beforehand.

Affected Examples:

code/deployment/CodeDeploymentExample

compute/ComputeAsyncExample

compute/ComputeBroadcastExample

compute/ComputeCancellationExample

compute/ComputeColocatedExample

compute/ComputeExample

compute/ComputeJobPriorityExample

compute/ComputeJobStateExample

compute/ComputeMapReduceExample

compute/ComputeWithCustomResultMarshallerExample

compute/ComputeWithResultExample

serialization/SerializationExample

streaming/DistributedComputeWithReceiverExample

streaming/MultiTableDataStreamerExample

Background / Motivation:
The ai3tests framework imports the ignite-examples JAR and drives each example class as an automated test, invoking them via a shared runExample(...) utility:
java@Test
@DisplayName("Run ComputeRustJobExample")
public void testCompute*Example()

{ runExample(Compute*Example.class); }
This pattern allows individual examples to be validated in a repeatable, CI-friendly way and forms the foundation for cyclic stability testing as well. For this to work reliably, examples must be executable directly via Gradle without requiring a manual build step beforehand — making this fix a prerequisite for stable automated test execution.
Fix:

Added to examples/java/build.gradle:

groovy
tasks.withType(JavaExec).configureEach {
dependsOn deploymentUnitJar
}
This ensures the deployment unit JAR is always built before any example class is executed via Gradle, regardless of whether build was run first.

[valepakh]

These changes seem unrelated to the deployment unit issue

[ashish-zs]

I agree. I see no difference with main. The files are identical. I even pasted the main one to this branch and there is no difference.