diff --git a/bundles/org.openhab.binding.exec/README.md b/bundles/org.openhab.binding.exec/README.md
index 8ed5aaca7920e..1ffd06b69c0b1 100644
--- a/bundles/org.openhab.binding.exec/README.md
+++ b/bundles/org.openhab.binding.exec/README.md
@@ -54,7 +54,7 @@ Please note that if the transformation failed or returned `null`, the original d
 Thing exec:command:uniquename [command="/command/to/execute here", interval=15, timeout=5, autorun=false]
 ```
 
-The `command` itself can be enhanced using the well known syntax of the [Java formatter class syntax](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Formatter.html#syntax).
+The `command` itself can be enhanced using the well known syntax of the [Java formatter class syntax](https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/util/Formatter.html#syntax).
 The following parameters are automatically added:
 
 - the current date (as java.util.Date, example: `%1$tY-%1$tm-%1$td`)
diff --git a/bundles/org.openhab.binding.http/README.md b/bundles/org.openhab.binding.http/README.md
index 4aae71596be70..9eda9e021bd46 100644
--- a/bundles/org.openhab.binding.http/README.md
+++ b/bundles/org.openhab.binding.http/README.md
@@ -159,7 +159,7 @@ All values that are not `upValue`, `downValue`, `stopValue`, `moveValue` are int
 
 ## URL Formatting
 
-After concatenation of the `baseURL` and the `commandExtension` or the `stateExtension` (if provided) the URL is formatted using the [java.util.Formatter](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Formatter.html).
+After concatenation of the `baseURL` and the `commandExtension` or the `stateExtension` (if provided) the URL is formatted using the [java.util.Formatter](https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/util/Formatter.html).
 The URL is used as format string and two parameters are added:
 
 - the current date (referenced as `%1$`)
diff --git a/bundles/org.openhab.binding.logreader/README.md b/bundles/org.openhab.binding.logreader/README.md
index a31e218e283b1..b1e067ddd2d28 100644
--- a/bundles/org.openhab.binding.logreader/README.md
+++ b/bundles/org.openhab.binding.logreader/README.md
@@ -27,7 +27,7 @@ The `reader` Thing has the following configuration parameters:
 | `customPatterns`              | String  |   no     |                                  | Search patterns separated by \| character for custom events.                            |
 | `customBlacklistingPatterns`  | String  |   no     |                                  | Search patterns for blacklisting unwanted custom events separated by \| character.      |
 
-Search patterns follows [Java regular expression syntax](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/regex/Pattern.html).
+Search patterns follows [Java regular expression syntax](https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/util/regex/Pattern.html).
 Be aware that search patterns are case sensitive.
 
 ## Channels
diff --git a/bundles/org.openhab.binding.mqtt.generic/README.md b/bundles/org.openhab.binding.mqtt.generic/README.md
index 2bce4766285c2..4821abd1d24ff 100644
--- a/bundles/org.openhab.binding.mqtt.generic/README.md
+++ b/bundles/org.openhab.binding.mqtt.generic/README.md
@@ -329,7 +329,7 @@ Please prefer formatting as described in the next section whenever possible.
 
 This feature is quite powerful in transforming an item state before it is published to the MQTT broker.
 It has the syntax: `%[flags][width]conversion`.
-Find the full documentation on the [Java](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Formatter.html) web page.
+Find the full documentation on the [Java](https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/util/Formatter.html) web page.
 
 The default is "%s" which means: Output the item state as string.
 
diff --git a/bundles/org.openhab.binding.mqtt/src/main/java/org/openhab/binding/mqtt/internal/ssl/PinTrustManager.java b/bundles/org.openhab.binding.mqtt/src/main/java/org/openhab/binding/mqtt/internal/ssl/PinTrustManager.java
index 3e7823124b090..2fe0dddb78c34 100644
--- a/bundles/org.openhab.binding.mqtt/src/main/java/org/openhab/binding/mqtt/internal/ssl/PinTrustManager.java
+++ b/bundles/org.openhab.binding.mqtt/src/main/java/org/openhab/binding/mqtt/internal/ssl/PinTrustManager.java
@@ -71,7 +71,7 @@ protected byte[] getEncoded(PinType type, X509Certificate cert) throws Certifica
 
     /**
      * A signature name depends on the security provider but usually follows
-     * https://docs.oracle.com/en/java/javase/17/docs/specs/security/standard-names.html#signature-algorithms.
+     * https://docs.oracle.com/en/java/javase/21/docs/specs/security/standard-names.html#signature-algorithms.
      * E.g.: "SHA256withRSA". We need "SHA" and "256" to initialize a {@link PinMessageDigest}.
      */
     PinMessageDigest getMessageDigestForSigAlg(String sigAlg) throws CertificateException {
diff --git a/bundles/org.openhab.binding.mqtt/xtend_examples.md b/bundles/org.openhab.binding.mqtt/xtend_examples.md
index 64e44d3c1ba82..7d2c6db572ead 100644
--- a/bundles/org.openhab.binding.mqtt/xtend_examples.md
+++ b/bundles/org.openhab.binding.mqtt/xtend_examples.md
@@ -39,7 +39,7 @@ mqtt:broker:myAuthentificatedBroker [ host="192.168.0.43", secure=false, usernam
 In a fourth connection, the public key pinning is enabled again.
 This time, a public key hash is provided to pin the connection to a specific server.
 It follows the form "hashname:hashvalue". Valid _hashnames_ are SHA-1, SHA-224, SHA-256, SHA-384, SHA-512 and all others listed
-in [Java MessageDigest Algorithms](https://docs.oracle.com/en/java/javase/17/docs/specs/security/standard-names.html#messagedigest-algorithms).
+in [Java MessageDigest Algorithms](https://docs.oracle.com/en/java/javase/21/docs/specs/security/standard-names.html#messagedigest-algorithms).
 
 `mqttConnections.things`:
 
diff --git a/bundles/org.openhab.binding.ntp/README.md b/bundles/org.openhab.binding.ntp/README.md
index 8289d5278f6b9..7e6ed9cc7a8ce 100644
--- a/bundles/org.openhab.binding.ntp/README.md
+++ b/bundles/org.openhab.binding.ntp/README.md
@@ -33,7 +33,7 @@ The ntp binding has two channels:
 - `dateTime` which provides the data in a dateTime type
 - `string` which provides the data in a string type. The string channel can be configured with the formatting of the date & time. This also allows proper representation of timezones other than the java machine default one.
 
-See the [Java documentation](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Formatter.html) for the detailed information on the formatting
+See the [Java documentation](https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/util/Formatter.html) for the detailed information on the formatting
 
 ## Full Example
 
diff --git a/bundles/org.openhab.binding.telegram/README.md b/bundles/org.openhab.binding.telegram/README.md
index fb0302b82767f..56f34aa7eea25 100644
--- a/bundles/org.openhab.binding.telegram/README.md
+++ b/bundles/org.openhab.binding.telegram/README.md
@@ -196,7 +196,7 @@ These actions will send a message to all chat ids configured for this bot.
 | Action                     | Description  |
 |----------------------------|--------------|
 | sendTelegram(String message) | Sends a message. |
-| sendTelegram(String format, Object... args)          | Sends a formatted message (See <https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Formatter.html> for more information).
+| sendTelegram(String format, Object... args)          | Sends a formatted message (See <https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/util/Formatter.html> for more information).
 | sendTelegramQuery(String message, String replyId, String... buttons) | Sends a question to the user that can be answered via the defined buttons. The replyId can be freely choosen and is sent back with the answer. Then, the id is required to identify what question has been answered (e.g. in case of multiple open questions). The final result looks like this: ![Telegram Inline Keyboard](doc/queryExample.png) |
 | sendTelegramAnswer(String replyId, String message) | Sends a message after the user has answered a question. You should _always_ call this method after you received an answer. It will remove buttons from the specific question and will also stop the progress bar displayed at the client side. If no message is necessary, just pass `null` here. |
 | deleteTelegramQuery(String replyId) | Deletes a question in the chat. The replyId must be the same as used for the corresponding sendTelegramQuery() action. |
diff --git a/bundles/org.openhab.io.metrics/README.md b/bundles/org.openhab.io.metrics/README.md
index c01ccc4ee60bb..3857965d78793 100644
--- a/bundles/org.openhab.io.metrics/README.md
+++ b/bundles/org.openhab.io.metrics/README.md
@@ -82,7 +82,7 @@ The InfluxDB exporter service will start as soon as the _influxMetricsEnabled_ c
 
 The Java Management Extensions (JMX) exporter service will start as soon as the _jmxMetricsEnabled_ configuration parameter is set to true.
 
-You can monitor the JMX metrics using a tool like [JConsole](https://docs.oracle.com/en/java/javase/17/management/using-jconsole.html) or [VisualVM](https://visualvm.github.io/) (after installing the VisualVM-MBeans plugin).
+You can monitor the JMX metrics using a tool like [JConsole](https://docs.oracle.com/en/java/javase/21/management/using-jconsole.html) or [VisualVM](https://visualvm.github.io/) (after installing the VisualVM-MBeans plugin).
 When the JMX exporter is enabled, the metrics will be available under the "metrics" MBean.
 JConsole and VisualVM will only be able to connect using JMX when openHAB is started in debug mode (use `start_debug.sh` or `start_debug.bat`).
 
diff --git a/bundles/org.openhab.transform.basicprofiles/README.md b/bundles/org.openhab.transform.basicprofiles/README.md
index 65629f1ef232d..1442490732557 100644
--- a/bundles/org.openhab.transform.basicprofiles/README.md
+++ b/bundles/org.openhab.transform.basicprofiles/README.md
@@ -106,7 +106,7 @@ Switch invertedSwitch { channel="xxx" [profile="basic-profiles:invert"] }
 ## Round Profile
 
 The Round Profile scales the State to a specific number of decimal places based on the power of ten.
-Optionally the [Rounding mode](https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/math/RoundingMode.html) can be set.
+Optionally the [Rounding mode](https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/math/RoundingMode.html) can be set.
 Source Channels should accept Item Type `Number`.
 
 ### Round Profile Configuration
diff --git a/bundles/org.openhab.transform.map/README.md b/bundles/org.openhab.transform.map/README.md
index 715e7bfbebac2..4e6370f5fd0a8 100644
--- a/bundles/org.openhab.transform.map/README.md
+++ b/bundles/org.openhab.transform.map/README.md
@@ -7,7 +7,7 @@ Transforms the input by mapping it to another string.
 The mapping is performed based on "key=value" pairs.
 When the input matches a `key` in the mapping table, the corresponding `value` is given as the output of the transformation.
 
-The format of the mapping table is documented [here](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Properties.html#load(java.io.Reader)).
+The format of the mapping table is documented [here](https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/util/Properties.html#load(java.io.Reader)).
 
 A default value can be provided if no matching entry is found by using "=value" syntax.
 Defining this default value using `_source_` would then return the non transformed input string.
diff --git a/bundles/org.openhab.transform.regex/README.md b/bundles/org.openhab.transform.regex/README.md
index d423049478a65..5321a4f971b56 100644
--- a/bundles/org.openhab.transform.regex/README.md
+++ b/bundles/org.openhab.transform.regex/README.md
@@ -8,7 +8,7 @@ A full regex is in the form `s/<regex>/<substitution>/g` whereat the delimiter `
 The regular expression in the format `s/<regex>/result/g`, replaces all occurrences of `<regex>` in the source string with `result`.
 The regular expression in the format `s/<regex>/result/` (without `g`), replaces the first occurrence of `<regex>` in the source string with `result`.
 
-If the regular expression contains a [capture group](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/regex/Pattern.html#cg) defined by `()`, it returns the captured string.
+If the regular expression contains a [capture group](https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/util/regex/Pattern.html#cg) defined by `()`, it returns the captured string.
 Multiple capture groups can be used to retrieve multiple strings and can be combined as a result string defined in the `substitution`.
 
 The transformation can be set to be restricted to only match if the input string begins with a character by prepending `^` to the beginning of a pattern or to only match if the input string ends with a specified character by appending `$` at the end.