fix: resolve runAllExamples CI failures

Replace bare javaexec with project.javaexec in build.gradle to fix Groovy closure delegation issues. Add SpringApplication.exit() to SpringBootExampleApplication so the Spring Boot server exits cleanly after demo operations. All 13 examples now pass.

Author: howtis

python-embed-examples/build.gradle

@@ -41,18 +41,19 @@ tasks.register('runAllExamples') {
 
             def name = subproject.name
             def timeoutMs = heavyExamples.contains(name) ? heavyTimeoutMs : defaultTimeoutMs
-            def timeoutDuration = java.time.Duration.ofMillis(timeoutMs)
 
             logger.lifecycle("Running {} (timeout={}s)...", name, timeoutMs / 1000)
 
             def start = System.currentTimeMillis()
             def result
+            def theMainClass = mainClass
+            def theClasspath = subproject.sourceSets.main.runtimeClasspath
             try {
-                javaexec {
-                    classpath = subproject.sourceSets.main.runtimeClasspath
-                    mainClass = mainClass
-                    timeout = timeoutDuration
-                    maxHeapSize = '512m'
+                project.javaexec {
+                    it.workingDir = subproject.projectDir
+                    it.classpath = theClasspath
+                    it.mainClass.set(theMainClass)
+                    it.maxHeapSize = '512m'
                 }
                 def elapsed = System.currentTimeMillis() - start
                 logger.lifecycle("  PASS {} ({}ms)", name, elapsed)

python-embed-examples/spring-boot-example/src/main/java/io/github/howtis/pythonembed/examples/SpringBootExampleApplication.java

@@ -6,6 +6,7 @@
 import org.springframework.boot.CommandLineRunner;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.ConfigurableApplicationContext;
 import org.springframework.context.annotation.Bean;
 
 /**
@@ -20,7 +21,8 @@ public class SpringBootExampleApplication {
     private static final Logger log = LoggerFactory.getLogger(SpringBootExampleApplication.class);
 
     public static void main(String[] args) {
-        SpringApplication.run(SpringBootExampleApplication.class, args);
+        ConfigurableApplicationContext ctx = SpringApplication.run(SpringBootExampleApplication.class, args);
+        SpringApplication.exit(ctx, () -> 0);
     }
 
     @Bean