Stop using Java code snippets in Kotlin ones

As a preparation to using a Kotlin 2 baseline, this commit stops using
Java code snippets in Kotlin ones in order to avoid redeclaration
errors.

See gh-33629

framework-docs/framework-docs.gradle

@@ -41,6 +41,13 @@ repositories {
 	}
 }
 
+// To avoid a redeclaration error with Kotlin compiler
+sourceSets {
+	main {
+		java.exclude("org/springframework/docs/**/*.java")
+	}
+}
+
 dependencies {
 	api(project(":spring-aspects"))
 	api(project(":spring-context"))
@@ -68,6 +75,7 @@ dependencies {
 	api("org.aspectj:aspectjweaver")
 	api("org.eclipse.jetty.websocket:jetty-websocket-jetty-api")
 	api("org.jetbrains.kotlin:kotlin-stdlib")
+	api("jakarta.websocket:jakarta.websocket-api")
 
 	implementation(project(":spring-core-test"))
 	implementation("org.assertj:assertj-core")

framework-docs/src/main/kotlin/org/springframework/docs/core/beans/dependencies/beansfactorylazyinit/AnotherBean.kt

@@ -0,0 +1,20 @@
+/*
+ * Copyright 2002-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.docs.core.beans.dependencies.beansfactorylazyinit
+
+class AnotherBean {
+}

framework-docs/src/main/kotlin/org/springframework/docs/core/beans/dependencies/beansfactorylazyinit/ExpensiveToCreateBean.kt

@@ -0,0 +1,20 @@
+/*
+ * Copyright 2002-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.docs.core.beans.dependencies.beansfactorylazyinit
+
+class ExpensiveToCreateBean {
+}

framework-docs/src/main/kotlin/org/springframework/docs/core/expressions/expressionsbeandef/CustomerPreferenceDao.kt

@@ -0,0 +1,20 @@
+/*
+ * Copyright 2002-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.docs.core.expressions.expressionsbeandef
+
+class CustomerPreferenceDao {
+}

framework-docs/src/main/kotlin/org/springframework/docs/core/expressions/expressionsbeandef/MovieFinder.kt

@@ -0,0 +1,21 @@
+/*
+ * Copyright 2002-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+package org.springframework.docs.core.expressions.expressionsbeandef
+
+class MovieFinder {
+}

framework-docs/src/main/kotlin/org/springframework/docs/dataaccess/jdbc/jdbccomplextypes/TestItem.kt

@@ -0,0 +1,21 @@
+/*
+ * Copyright 2002-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.docs.dataaccess.jdbc.jdbccomplextypes
+
+import java.util.Date
+
+data class TestItem(val id: Long, val description: String, val expirationDate: Date)

framework-docs/src/main/kotlin/org/springframework/docs/dataaccess/jdbc/jdbccomplextypes/TestItemStoredProcedure.kt

@@ -31,11 +31,11 @@ class TestItemStoredProcedure(dataSource: DataSource) : StoredProcedure(dataSour
 				cs: CallableStatement, colIndx: Int, _: Int, _: String? ->
 				val struct = cs.getObject(colIndx) as Struct
 				val attr = struct.attributes
-				val item = TestItem()
-				item.id = (attr[0] as Number).toLong()
-				item.description = attr[1] as String
-				item.expirationDate = attr[2] as Date
-				item
+				TestItem(
+					(attr[0] as Number).toLong(),
+					attr[1] as String,
+					attr[2] as Date
+				)
 			})
 		// ...
 	}

framework-docs/src/main/kotlin/org/springframework/docs/dataaccess/jdbc/jdbcjdbctemplateidioms/CorporateEventDao.kt

@@ -0,0 +1,20 @@
+/*
+ * Copyright 2002-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.docs.dataaccess.jdbc.jdbcjdbctemplateidioms
+
+interface CorporateEventDao {
+}

framework-docs/src/main/kotlin/org/springframework/docs/integration/jmx/jmxexporting/IJmxTestBean.kt

@@ -0,0 +1,25 @@
+/*
+ * Copyright 2002-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.docs.integration.jmx.jmxexporting
+
+interface IJmxTestBean {
+
+	var name: String
+	var age: Int
+	fun add(x: Int, y: Int): Int
+	fun dontExposeMe()
+}

framework-docs/src/main/kotlin/org/springframework/docs/integration/jmx/jmxexporting/JmxTestBean.kt

@@ -19,24 +19,8 @@ package org.springframework.docs.integration.jmx.jmxexporting
 // tag::snippet[]
 class JmxTestBean : IJmxTestBean {
 
-	private lateinit var name: String
-	private var age = 0
-
-	override fun getAge(): Int {
-		return age
-	}
-
-	override fun setAge(age: Int) {
-		this.age = age
-	}
-
-	override fun setName(name: String) {
-		this.name = name
-	}
-
-	override fun getName(): String {
-		return name
-	}
+	override lateinit var name: String
+	override var age = 0
 
 	override fun add(x: Int, y: Int): Int {
 		return x + y

framework-docs/src/main/kotlin/org/springframework/docs/integration/mailusagesimple/Customer.kt

@@ -0,0 +1,23 @@
+/*
+ * Copyright 2002-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.docs.integration.mailusagesimple
+
+data class Customer(
+	val emailAddress: String,
+	val firstName: String,
+	val lastName: String
+)

framework-docs/src/main/kotlin/org/springframework/docs/integration/mailusagesimple/Order.kt

@@ -0,0 +1,22 @@
+/*
+ * Copyright 2002-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.docs.integration.mailusagesimple
+
+data class Order(
+	val customer: Customer,
+	val orderNumber: String
+)

framework-docs/src/main/kotlin/org/springframework/docs/testing/mockmvc/assertj/mockmvctestersetup/AccountController.kt

@@ -0,0 +1,23 @@
+/*
+ * Copyright 2002-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.docs.testing.mockmvc.assertj.mockmvctestersetup
+
+import org.springframework.web.bind.annotation.RestController
+
+@RestController
+class AccountController {
+}

framework-docs/src/main/kotlin/org/springframework/docs/testing/mockmvc/assertj/mockmvctestersetup/ApplicationWebConfiguration.kt

@@ -0,0 +1,25 @@
+/*
+ * Copyright 2002-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.docs.testing.mockmvc.assertj.mockmvctestersetup
+
+import org.springframework.context.annotation.Configuration
+import org.springframework.web.servlet.config.annotation.EnableWebMvc
+
+@Configuration(proxyBeanMethods = false)
+@EnableWebMvc
+class ApplicationWebConfiguration {
+}

framework-docs/src/main/kotlin/org/springframework/docs/web/webmvc/mvcconfig/mvcconfigvalidation/FooValidator.kt

@@ -0,0 +1,27 @@
+/*
+ * Copyright 2002-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.docs.web.webmvc.mvcconfig.mvcconfigvalidation
+
+import org.springframework.validation.Errors
+import org.springframework.validation.Validator
+
+class FooValidator : Validator {
+	override fun supports(clazz: Class<*>) = false
+
+	override fun validate(target: Any, errors: Errors) {
+	}
+}

framework-docs/src/main/kotlin/org/springframework/docs/web/websocket/websocketserverruntimeconfiguration/MyEchoHandler.kt

@@ -0,0 +1,22 @@
+/*
+ * Copyright 2002-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.docs.web.websocket.websocketserverruntimeconfiguration
+
+import org.springframework.web.socket.handler.AbstractWebSocketHandler
+
+class MyEchoHandler : AbstractWebSocketHandler() {
+}