Fix build on Java 9+ JDKs

[#479]

Signed-off-by: Mark Paluch <[email protected]>

Author: mp911de

pom.xml

@@ -169,12 +169,6 @@
             <version>${blockhound.version}</version>
             <scope>test</scope>
         </dependency>
-        <dependency>
-            <groupId>io.projectreactor.tools</groupId>
-            <artifactId>blockhound-junit-platform</artifactId>
-            <version>${blockhound.version}</version>
-            <scope>test</scope>
-        </dependency>
         <dependency>
             <groupId>io.r2dbc</groupId>
             <artifactId>r2dbc-spi-test</artifactId>
@@ -446,6 +440,22 @@
 
     <profiles>
 
+        <profile>
+            <id>java18-blockhound</id>
+            <activation>
+                <jdk>1.8</jdk>
+            </activation>
+
+            <dependencies>
+                <dependency>
+                    <groupId>io.projectreactor.tools</groupId>
+                    <artifactId>blockhound-junit-platform</artifactId>
+                    <version>${blockhound.version}</version>
+                    <scope>test</scope>
+                </dependency>
+            </dependencies>
+        </profile>
+
         <profile>
             <id>jmh</id>
             <dependencies>

src/main/java/io/r2dbc/postgresql/extension/CodecRegistrar.java

@@ -25,9 +25,9 @@
 
 /**
  * Registrar interface that is used to register {@link Codec}s as extension to built-in codecs.
- * <p>Implementations may use {@link PostgresqlConnection} to query Postgres information schema to discover type details such as extension type OIDs.
+ * <p>Implementations may use {@link PostgresqlConnection} to query Postgres information schema to discover type details such as extension type OIDs.</p>
  *
- * <h3>Constructor Requirements</h3>
+ * <strong>Constructor Requirements</strong>
  * <p>Extension implementations must have a <em>default constructor</em> if registered via the {@code ServiceLoader}.  When registered through
  * {@link io.r2dbc.postgresql.PostgresqlConnectionConfiguration} the default constructor is not required to be {@code public}.
  * When registered via the {@code ServiceLoader} the default constructor must be {@code public}.

src/main/java/io/r2dbc/postgresql/extension/Extension.java

@@ -27,13 +27,13 @@
  * what is available in the classpath.
  * <p>
  * Specifically, a custom extension can be registered by supplying its fully qualified class name in a file named {@code io.r2dbc.postgresql.extension.Extension} within the
- * {@code /META-INF/services} directory in its enclosing JAR file.
+ * {@code /META-INF/services} directory in its enclosing JAR file.</p>
  *
- * <h3>Configuring Automatic Extension Detection</h3>
- * Auto-detection is enabled by default. To disable it, simply set the {@link io.r2dbc.postgresql.PostgresqlConnectionConfiguration.Builder#autodetectExtensions(boolean)} parameter to
- * {@code false}.
+ * <strong>Configuring Automatic Extension Detection</strong>
+ * <p>Auto-detection is enabled by default. To disable it, simply set the {@link io.r2dbc.postgresql.PostgresqlConnectionConfiguration.Builder#autodetectExtensions(boolean)} parameter to
+ * {@code false}.</p>
  *
- * <h3>Constructor Requirements</h3>
+ * <strong>Constructor Requirements</strong>
  * <p>Extension implementations must have a <em>default constructor</em> if registered via the {@code ServiceLoader}.  When registered through
  * {@link io.r2dbc.postgresql.PostgresqlConnectionConfiguration} the default constructor is not required to be {@code public}.
  * When registered via the {@code ServiceLoader} the default constructor must be {@code public}.