Link to Java 17 documentation (#2119)

This prevents issues because older documentation may not apply to Java 17.

Signed-off-by: Wouter Born <github@maindrain.net>

developers/guidelines.md

@@ -159,7 +159,7 @@ See [Default libraries](#default-libraries) for more details.
 1. Creation of threads must be avoided.
   Instead, resort into using existing schedulers which use pre-configured thread pools.
   If there is no suitable scheduler available, start a discussion in the forum about it rather than creating a thread by yourself.
-  For periodically executed jobs that do not require a fixed rate [scheduleWithFixedDelay](https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/concurrent/ScheduledExecutorService.html#scheduleWithFixedDelay(java.lang.Runnable,long,long,java.util.concurrent.TimeUnit)) should be preferred over [scheduleAtFixedRate](https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/concurrent/ScheduledExecutorService.html#scheduleAtFixedRate(java.lang.Runnable,long,long,java.util.concurrent.TimeUnit)).
+  For periodically executed jobs that do not require a fixed rate [scheduleWithFixedDelay](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/concurrent/ScheduledExecutorService.html#scheduleWithFixedDelay(java.lang.Runnable,long,long,java.util.concurrent.TimeUnit)) should be preferred over [scheduleAtFixedRate](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/concurrent/ScheduledExecutorService.html#scheduleAtFixedRate(java.lang.Runnable,long,long,java.util.concurrent.TimeUnit)).
 1. Bundles need to cleanly start and stop without throwing exceptions or malfunctioning.
   This can be tested by manually starting and stopping the bundle from the console (```stop <bundle-id>``` resp. ```start <bundle-id>```).
 1. Bundles must not require any substantial CPU time.

developers/osgi/osgi.md

@@ -42,7 +42,7 @@ More details about the OSGi architecture can be found at <https://www.osgi.org/d
 Modules (called **bundles**) are the smallest unit of modularization.
 Technically a bundle is a JAR file with additional meta information.
 This information is stored in file called [**manifest**](#important-definitions) file.
-The manifest file is part of the standard [JAR specification](https://docs.oracle.com/en/java/javase/11/docs/specs/jar/jar.html#jar-manifest), but OSGi adds additional metadata to it in form of specific headers.
+The manifest file is part of the standard [JAR specification](https://docs.oracle.com/en/java/javase/17/docs/specs/jar/jar.html#jar-manifest), but OSGi adds additional metadata to it in form of specific headers.
 The _Bundle-SymbolicName_ and the _Bundle-Version_ headers uniquely identify a bundle.
 In OSGi is allowed to have **bundles with same name, but different version running at the same time.**
 

ui/sitemaps.md

@@ -517,7 +517,7 @@ Adds a time-series chart object for the display of logged data.
 - `forceasitem` is used to show the value of a `Group` instead of showing a graph for each member (which is the default).
 
 - `yAxisDecimalPattern` is used to format the values on the y axis.
-    It accepts [DecimalFormat](https://docs.oracle.com/javase/7/docs/api/java/text/DecimalFormat.html).
+    It accepts [DecimalFormat](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/text/DecimalFormat.html).
     For example with `#.##` a number has to decimals.
 
 Visit [Charts](https://github.com/openhab/openhab/wiki/Charts) in the Wiki for examples.