Migrate to Java 17

[robfrank]

Migrate to Java 17

• first step: just migrate compile and runtime without touching/adapting the code

[gramian]

For finalization:

• README: Update text and remove button
• Docs: Update Section 11.9 (@gramian)

[gramian]

If this is relevant: Following I gathered the deprecation warnings in the compiler output:

[WARNING] arcadedb/engine/src/main/java/com/arcadedb/serializer/UnsignedBytesComparator.java:[22,16] sun.misc.Unsafe is internal proprietary API and may be removed in a future release
[WARNING] arcadedb/engine/src/main/java/com/arcadedb/Profiler.java:[212,27] sun.management.HotspotRuntimeMBean is internal proprietary API and may be removed in a future release
[WARNING] arcadedb/engine/src/main/java/com/arcadedb/Profiler.java:[212,79] sun.management.ManagementFactoryHelper is internal proprietary API and may be removed in a future release
[WARNING] arcadedb/engine/src/main/java/com/arcadedb/serializer/UnsignedBytesComparator.java:[38,24] sun.misc.Unsafe is internal proprietary API and may be removed in a future release
[WARNING] arcadedb/engine/src/main/java/com/arcadedb/serializer/UnsignedBytesComparator.java:[179,18] sun.misc.Unsafe is internal proprietary API and may be removed in a future release
[WARNING] arcadedb/engine/src/main/java/com/arcadedb/serializer/UnsignedBytesComparator.java:[181,14] sun.misc.Unsafe is internal proprietary API and may be removed in a future release
[WARNING] arcadedb/engine/src/main/java/com/arcadedb/serializer/UnsignedBytesComparator.java:[186,71] sun.misc.Unsafe is internal proprietary API and may be removed in a future release
[WARNING] arcadedb/engine/src/main/java/com/arcadedb/serializer/UnsignedBytesComparator.java:[187,21] sun.misc.Unsafe is internal proprietary API and may be removed in a future release
[WARNING] arcadedb/engine/src/main/java/com/arcadedb/serializer/UnsignedBytesComparator.java:[187,33] sun.misc.Unsafe is internal proprietary API and may be removed in a future release
[WARNING] arcadedb/engine/src/main/java/com/arcadedb/serializer/UnsignedBytesComparator.java:[186,14] java.security.AccessController in java.security has been deprecated and marked for removal

[WARNING] arcadedb/server/src/main/java/com/arcadedb/server/monitor/ServerMonitor.java:[107,25] sun.management.HotspotRuntimeMBean is internal proprietary API and may be removed in a future release
[WARNING] arcadedb/server/src/main/java/com/arcadedb/server/monitor/ServerMonitor.java:[107,70] sun.management.ManagementFactoryHelper is internal proprietary API and may be removed in a future release

Maybe Java17 has "easy" solutions?

[lvca]

@gramian good point! There are new API now to do the same things without using Unsafe: https://openjdk.org/jeps/471, @robfrank we should investigate. ArcadeDB already check if Unsafe is available, then use it because faster than pure Java comparator.