[FLINK-15736][docs] Add Java compatibility page

docs/content.zh/docs/deployment/java_compatibility.md

@@ -0,0 +1,77 @@
+---
+title: Java Compatibility
+weight: 2
+type: docs
+---
+<!--
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements.  See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership.  The ASF licenses this file
+to you 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
+
+  http://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.
+-->
+
+# Java compatibility
+
+This page lists which Java versions Flink supports and what limitations apply (if any).
+
+## Java 8 (deprecated)
+
+Support for Java 8 has been deprecated in 1.15.0.
+It is recommended to migrate to Java 11.
+
+## Java 11
+
+Support for Java 11 was added in 1.10.0 and is the recommended Java version to run Flink on.
+
+This is the default version for docker images.
+
+### Untested Flink features
+
+The following Flink features have not been tested with Java 11:
+
+* Hive connector
+* Hbase 1.x connector
+
+### Untested language features
+
+* Modularized user jars have not been tested.
+
+## Java 17
+
+Experimental support for Java 17 was added in 1.18.0. ([FLINK-15736](https://issues.apache.org/jira/browse/FLINK-15736))
+
+### Untested Flink features
+
+These Flink features have not been tested with Java 17:
+
+* Hive connector
+* Hbase 1.x connector
+
+### JDK modularization
+
+Starting with Java 16 Java applications have to fully cooperate with the JDK modularization, also known as [Project Jigsaw](https://openjdk.org/projects/jigsaw/).
+This means that access to JDK classes/internal must be explicitly allowed by the application when it is started, on a per-module basis, in the form of --add-opens/--add-exports JVM arguments.
+
+Since Flink uses reflection for serializing user-defined functions and data (via Kryo), this means that if your UDFs or data types use JDK classes you may have to allow access to these JDK classes.
+
+These should be configured via the [env.java.opts.all]({{< ref "docs/deployment/config" >}}#env-java-opts-all) option.
+
+In the default configuration in the Flink distribution this option is configured such that Flink itself works on Java 17.  
+The list of configured arguments must not be shortened, but only extended.
+
+### Known issues
+
+* Java records are not supported. See [FLINK-32380](https://issues.apache.org/jira/browse/FLINK-32380) for updates.
+* SIGSEGV in C2 Compiler thread: Early Java 17 builds are affected by a bug where the JVM can fail abruptly. Update your Java 17 installation to resolve the issue. See [JDK-8277529](https://bugs.openjdk.org/browse/JDK-8277529) for details.

docs/content/docs/deployment/java_compatibility.md

@@ -0,0 +1,77 @@
+---
+title: Java Compatibility
+weight: 2
+type: docs
+---
+<!--
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements.  See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership.  The ASF licenses this file
+to you 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
+
+  http://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.
+-->
+
+# Java compatibility
+
+This page lists which Java versions Flink supports and what limitations apply (if any).
+
+## Java 8 (deprecated)
+
+Support for Java 8 has been deprecated in 1.15.0.
+It is recommended to migrate to Java 11.
+
+## Java 11
+
+Support for Java 11 was added in 1.10.0 and is the recommended Java version to run Flink on.
+
+This is the default version for docker images.
+
+### Untested Flink features
+
+The following Flink features have not been tested with Java 11:
+
+* Hive connector
+* Hbase 1.x connector
+
+### Untested language features
+
+* Modularized user jars have not been tested.
+
+## Java 17
+
+Experimental support for Java 17 was added in 1.18.0. ([FLINK-15736](https://issues.apache.org/jira/browse/FLINK-15736))
+
+### Untested Flink features
+
+These Flink features have not been tested with Java 17:
+
+* Hive connector
+* Hbase 1.x connector
+
+### JDK modularization
+
+Starting with Java 16 Java applications have to fully cooperate with the JDK modularization, also known as [Project Jigsaw](https://openjdk.org/projects/jigsaw/).
+This means that access to JDK classes/internal must be explicitly allowed by the application when it is started, on a per-module basis, in the form of --add-opens/--add-exports JVM arguments.
+
+Since Flink uses reflection for serializing user-defined functions and data (via Kryo), this means that if your UDFs or data types use JDK classes you may have to allow access to these JDK classes.
+
+These should be configured via the [env.java.opts.all]({{< ref "docs/deployment/config" >}}#env-java-opts-all) option.
+
+In the default configuration in the Flink distribution this option is configured such that Flink itself works on Java 17.  
+The list of configured arguments must not be shortened, but only extended.
+
+### Known issues
+
+* Java records are not supported. See [FLINK-32380](https://issues.apache.org/jira/browse/FLINK-32380) for updates.
+* SIGSEGV in C2 Compiler thread: Early Java 17 builds are affected by a bug where the JVM can fail abruptly. Update your Java 17 installation to resolve the issue. See [JDK-8277529](https://bugs.openjdk.org/browse/JDK-8277529) for details.

docs/content/docs/deployment/memory/_index.md

@@ -20,4 +20,4 @@ software distributed under the License is distributed on an
 KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
--->
+-->