diff --git a/modules/com.dbeaver.jdbc.api/META-INF/MANIFEST.MF b/modules/com.dbeaver.jdbc.api/META-INF/MANIFEST.MF
index 29ee8b8..114b8e3 100644
--- a/modules/com.dbeaver.jdbc.api/META-INF/MANIFEST.MF
+++ b/modules/com.dbeaver.jdbc.api/META-INF/MANIFEST.MF
@@ -5,7 +5,7 @@ Bundle-Vendor: DBeaver Corp
 Bundle-SymbolicName: com.dbeaver.jdbc.api
 Bundle-Version: 2.3.1.qualifier
 Bundle-Release-Date: 20240205
-Bundle-RequiredExecutionEnvironment: JavaSE-17
+Bundle-RequiredExecutionEnvironment: JavaSE-11
 Require-Bundle: org.jkiss.utils
 Export-Package: com.dbeaver.jdbc.model
 Automatic-Module-Name: com.dbeaver.jdbc.api
diff --git a/modules/com.dbeaver.jdbc.api/src/com/dbeaver/jdbc/model/AbstractJdbcResultSet.java b/modules/com.dbeaver.jdbc.api/src/com/dbeaver/jdbc/model/AbstractJdbcResultSet.java
index 45d6a2a..77caacb 100644
--- a/modules/com.dbeaver.jdbc.api/src/com/dbeaver/jdbc/model/AbstractJdbcResultSet.java
+++ b/modules/com.dbeaver.jdbc.api/src/com/dbeaver/jdbc/model/AbstractJdbcResultSet.java
@@ -137,8 +137,8 @@ public double getDouble(int columnIndex) throws SQLException {
     public BigDecimal getBigDecimal(int columnIndex, int scale) throws SQLException {
         Object object = getObject(columnIndex);
         return object == null ? null :
-            object instanceof BigDecimal bd ? bd :
-                object instanceof Long str ? BigDecimal.valueOf(str) : BigDecimal.valueOf(CommonUtils.toDouble(object));
+            object instanceof BigDecimal ? (BigDecimal) object :
+                object instanceof Long ? BigDecimal.valueOf((Long) object) : BigDecimal.valueOf(CommonUtils.toDouble(object));
     }
 
     @Override
@@ -197,21 +197,21 @@ protected <T extends java.util.Date> T parseDate(Class<T> type, String value) th
     public Date getDate(int columnIndex, Calendar cal) throws SQLException {
         Object object = getObject(columnIndex);
         return object == null ? null :
-            object instanceof Date date ? date : parseDate(Date.class, object.toString());
+            object instanceof Date ? (Date) object : parseDate(Date.class, object.toString());
     }
 
     @Override
     public Time getTime(int columnIndex, Calendar cal) throws SQLException {
         Object object = getObject(columnIndex);
         return object == null ? null :
-            object instanceof Time time ? time : parseDate(Time.class, object.toString());
+            object instanceof Time ? (Time) object : parseDate(Time.class, object.toString());
     }
 
     @Override
     public Timestamp getTimestamp(int columnIndex, Calendar cal) throws SQLException {
         Object object = getObject(columnIndex);
         return object == null ? null :
-            object instanceof Timestamp timestamp ? timestamp : parseDate(Timestamp.class, object.toString());
+            object instanceof Timestamp ? (Timestamp) object : parseDate(Timestamp.class, object.toString());
     }
 
     @Override
diff --git a/modules/com.dbeaver.rpc/META-INF/MANIFEST.MF b/modules/com.dbeaver.rpc/META-INF/MANIFEST.MF
index 17f7128..d7a4dc8 100644
--- a/modules/com.dbeaver.rpc/META-INF/MANIFEST.MF
+++ b/modules/com.dbeaver.rpc/META-INF/MANIFEST.MF
@@ -5,7 +5,7 @@ Bundle-Vendor: DBeaver Corp
 Bundle-SymbolicName: com.dbeaver.rpc
 Bundle-Version: 2.3.1.qualifier
 Bundle-Release-Date: 20240205
-Bundle-RequiredExecutionEnvironment: JavaSE-17
+Bundle-RequiredExecutionEnvironment: JavaSE-11
 Require-Bundle: org.jkiss.utils,
  com.google.gson
 Export-Package: com.dbeaver.rpc
diff --git a/modules/org.jkiss.utils/META-INF/MANIFEST.MF b/modules/org.jkiss.utils/META-INF/MANIFEST.MF
index c99a4fb..56b4593 100644
--- a/modules/org.jkiss.utils/META-INF/MANIFEST.MF
+++ b/modules/org.jkiss.utils/META-INF/MANIFEST.MF
@@ -5,7 +5,7 @@ Bundle-Vendor: DBeaver Corp
 Bundle-SymbolicName: org.jkiss.utils
 Bundle-Version: 2.3.1.qualifier
 Bundle-Release-Date: 20240205
-Bundle-RequiredExecutionEnvironment: JavaSE-17
+Bundle-RequiredExecutionEnvironment: JavaSE-11
 Require-Bundle: com.google.gson
 Export-Package: org.jkiss.api,
  org.jkiss.api.verification,
diff --git a/modules/org.jkiss.utils/src/org/jkiss/api/DriverReference.java b/modules/org.jkiss.utils/src/org/jkiss/api/DriverReference.java
index 8934a51..12fecd3 100644
--- a/modules/org.jkiss.utils/src/org/jkiss/api/DriverReference.java
+++ b/modules/org.jkiss.utils/src/org/jkiss/api/DriverReference.java
@@ -18,15 +18,27 @@
 
 import org.jkiss.code.NotNull;
 
+import java.util.Objects;
+
 /**
  * Represents a reference to a driver. Instead of storing two separate fields,
  * it encapsulates them into one entity that is easily searchable through the code base.
- *
- * @param providerId id of the provider
- * @param driverId   id of the driver
  */
-public record DriverReference(@NotNull String providerId, @NotNull String driverId) {
+public final class DriverReference {
     public static final DriverReference UNKNOWN = new DriverReference("", "");
+    @NotNull
+    private final String providerId;
+    @NotNull
+    private final String driverId;
+
+    /**
+     * @param providerId id of the provider
+     * @param driverId   id of the driver
+     */
+    public DriverReference(@NotNull String providerId, @NotNull String driverId) {
+        this.providerId = providerId;
+        this.driverId = driverId;
+    }
 
     @NotNull
     public static DriverReference of(@NotNull String shortId) {
@@ -51,4 +63,29 @@ public String shortId() {
     public String toString() {
         return shortId();
     }
+
+    @NotNull
+    public String providerId() {
+        return providerId;
+    }
+
+    @NotNull
+    public String driverId() {
+        return driverId;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == this) return true;
+        if (obj == null || obj.getClass() != this.getClass()) return false;
+        var that = (DriverReference) obj;
+        return Objects.equals(this.providerId, that.providerId) &&
+            Objects.equals(this.driverId, that.driverId);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(providerId, driverId);
+    }
+
 }
diff --git a/modules/org.jkiss.utils/src/org/jkiss/utils/CommonUtils.java b/modules/org.jkiss.utils/src/org/jkiss/utils/CommonUtils.java
index cd71f57..8edb6b0 100644
--- a/modules/org.jkiss.utils/src/org/jkiss/utils/CommonUtils.java
+++ b/modules/org.jkiss.utils/src/org/jkiss/utils/CommonUtils.java
@@ -52,11 +52,21 @@ public static String escapeJavaString(@NotNull String str) {
         for (int i = 0; i < str.length(); i++) {
             char c = str.charAt(i);
             switch (c) {
-                case '"' -> res.append("\\\"");
-                case '\n' -> res.append("\\n");
-                case '\r' -> res.append("\\r");
-                case '\t' -> res.append("\\t");
-                default -> res.append(c);
+                case '"':
+                    res.append("\\\"");
+                    break;
+                case '\n':
+                    res.append("\\n");
+                    break;
+                case '\r':
+                    res.append("\\r");
+                    break;
+                case '\t':
+                    res.append("\\t");
+                    break;
+                default:
+                    res.append(c);
+                    break;
             }
         }
         return res.toString();
@@ -280,7 +290,8 @@ public static boolean getBoolean(@Nullable String value, boolean defaultValue) {
     public static boolean getBoolean(@Nullable Object value, boolean defaultValue) {
         if (value == null) {
             return defaultValue;
-        } else if (value instanceof Boolean b) {
+        } else if (value instanceof Boolean) {
+            Boolean b = (Boolean) value;
             return b;
         } else {
             return getBoolean(value.toString(), defaultValue);
@@ -299,7 +310,8 @@ public static Throwable getRootCause(@NotNull Throwable ex) {
         for (; ; ) {
             if (rootCause.getCause() != null) {
                 rootCause = rootCause.getCause();
-            } else if (rootCause instanceof InvocationTargetException ite && ite.getTargetException() != null) {
+            } else if (rootCause instanceof InvocationTargetException && ((InvocationTargetException) rootCause).getTargetException() != null) {
+                InvocationTargetException ite = (InvocationTargetException) rootCause;
                 rootCause = ite.getTargetException();
             } else {
                 break;
@@ -317,7 +329,8 @@ public static <T extends Exception> T getCauseOfType(@NotNull Throwable ex, Clas
             }
             if (rootCause.getCause() != null) {
                 rootCause = rootCause.getCause();
-            } else if (rootCause instanceof InvocationTargetException ite && ite.getTargetException() != null) {
+            } else if (rootCause instanceof InvocationTargetException && ((InvocationTargetException) rootCause).getTargetException() != null) {
+                InvocationTargetException ite = (InvocationTargetException) rootCause;
                 rootCause = ite.getTargetException();
             } else {
                 break;
@@ -371,7 +384,8 @@ public static boolean equalsContents(@Nullable Collection<?> c1, @Nullable Colle
     public static String toString(@Nullable Object object) {
         if (object == null) {
             return "";
-        } else if (object instanceof String s) {
+        } else if (object instanceof String) {
+            String s = (String) object;
             return s;
         } else {
             String strValue = object.toString();
@@ -382,7 +396,8 @@ public static String toString(@Nullable Object object) {
     public static String toString(@Nullable Object object, String def) {
         if (object == null) {
             return def;
-        } else if (object instanceof String s) {
+        } else if (object instanceof String) {
+            String s = (String) object;
             return s;
         } else {
             return object.toString();
@@ -392,7 +407,8 @@ public static String toString(@Nullable Object object, String def) {
     public static boolean toBoolean(@Nullable Object object, boolean def) {
         if (object == null) {
             return def;
-        } else if (object instanceof Boolean b) {
+        } else if (object instanceof Boolean) {
+            Boolean b = (Boolean) object;
             return b;
         } else {
             return getBoolean(object.toString(), def);
@@ -406,7 +422,8 @@ public static boolean toBoolean(@Nullable Object object) {
     public static int toInt(@Nullable Object object, int def) {
         if (object == null) {
             return def;
-        } else if (object instanceof Number n) {
+        } else if (object instanceof Number) {
+            Number n = (Number) object;
             return n.intValue();
         } else {
             String strValue = toString(object);
@@ -451,7 +468,8 @@ public static long toLong(@Nullable Object object) {
     public static long toLong(@Nullable Object object, long defValue) {
         if (object == null) {
             return defValue;
-        } else if (object instanceof Number n) {
+        } else if (object instanceof Number) {
+            Number n = (Number) object;
             return n.longValue();
         } else {
             try {
diff --git a/modules/org.jkiss.utils/src/org/jkiss/utils/rest/JsonRpcClient.java b/modules/org.jkiss.utils/src/org/jkiss/utils/rest/JsonRpcClient.java
index d6f6073..04098ae 100644
--- a/modules/org.jkiss.utils/src/org/jkiss/utils/rest/JsonRpcClient.java
+++ b/modules/org.jkiss.utils/src/org/jkiss/utils/rest/JsonRpcClient.java
@@ -24,6 +24,7 @@
 
 import java.lang.reflect.Method;
 import java.net.URI;
+import java.util.ArrayList;
 import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
@@ -110,7 +111,7 @@ protected String invokeRemoteMethod(
         ) {
             try {
                 Map<String, Object> fullRequest = new LinkedHashMap<>();
-                List<JsonElement> paramList = values.values().stream().toList();
+                List<JsonElement> paramList = new ArrayList<>(values.values());
                 fullRequest.put(method.getName(), paramList);
                 String requestString = gson.toJson(fullRequest);
 
diff --git a/modules/org.jkiss.utils/src/org/jkiss/utils/rest/RestServer.java b/modules/org.jkiss.utils/src/org/jkiss/utils/rest/RestServer.java
index 820d3d8..6980290 100644
--- a/modules/org.jkiss.utils/src/org/jkiss/utils/rest/RestServer.java
+++ b/modules/org.jkiss.utils/src/org/jkiss/utils/rest/RestServer.java
@@ -132,7 +132,7 @@ protected RequestHandler(
         @Override
         public void handle(HttpExchange exchange) throws IOException {
 
-            try (exchange) {
+            try {
                 Response<?> response;
                 try {
                     response = executeRequest(exchange);
@@ -175,6 +175,8 @@ public void handle(HttpExchange exchange) throws IOException {
             } catch (Throwable e) {
                 log.log(Level.SEVERE, "Internal IO error", e);
                 throw e;
+            } finally {
+                exchange.close();
             }
         }
 
@@ -228,7 +230,8 @@ protected Response<?> executeRequest(@NotNull HttpExchange exchange) throws IOEx
                 final Type type = method.getGenericReturnType();
                 return createResponseContent(result, type);
             } catch (Throwable e) {
-                if (e instanceof InvocationTargetException ite) {
+                if (e instanceof InvocationTargetException) {
+                    InvocationTargetException ite = (InvocationTargetException) e;
                     e = ite.getTargetException();
                 }
                 log.log(Level.SEVERE, "RPC call '" + uri + "' failed: " + e.getMessage());
diff --git a/modules/org.jkiss.utils/src/org/jkiss/utils/xml/XMLUtils.java b/modules/org.jkiss.utils/src/org/jkiss/utils/xml/XMLUtils.java
index 0185a96..125b104 100644
--- a/modules/org.jkiss.utils/src/org/jkiss/utils/xml/XMLUtils.java
+++ b/modules/org.jkiss.utils/src/org/jkiss/utils/xml/XMLUtils.java
@@ -242,14 +242,20 @@ public static boolean isValidXMLChar(char c) {
      * @return XML-encoded text
      */
     public static String encodeXMLChar(char ch) {
-        return switch (ch) {
-            case '&' -> "&amp;";
-            case '\"' -> "&quot;";
-            case '\'' -> "&#39;";
-            case '<' -> "&lt;";
-            case '>' -> "&gt;";
-            default -> null;
-        };
+        switch (ch) {
+            case '&':
+                return "&amp;";
+            case '\"':
+                return "&quot;";
+            case '\'':
+                return "&#39;";
+            case '<':
+                return "&lt;";
+            case '>':
+                return "&gt;";
+            default:
+                return null;
+        }
     }
 
     public static XMLException adaptSAXException(Exception toCatch) {
diff --git a/modules/pom.xml b/modules/pom.xml
index 6ae262e..fed0edb 100644
--- a/modules/pom.xml
+++ b/modules/pom.xml
@@ -22,4 +22,21 @@
         <module>com.dbeaver.rpc</module>
     </modules>
 
+    <build>
+        <plugins>
+            <!-- Use minimum supported Java -->
+            <plugin>
+                <groupId>org.eclipse.tycho</groupId>
+                <artifactId>tycho-compiler-plugin</artifactId>
+                <version>${tycho-version}</version>
+                <configuration>
+                    <useProjectSettings>false</useProjectSettings>
+                    <source>${java.version.min}</source>
+                    <target>${java.version.min}</target>
+                    <compilerVersion>${java.version.min}</compilerVersion>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
 </project>
diff --git a/root/pom.xml b/root/pom.xml
index 4151aa4..6a7a8b8 100644
--- a/root/pom.xml
+++ b/root/pom.xml
@@ -27,6 +27,7 @@
         <local-p2-repo.url>https://p2.dev.dbeaver.com/eclipse-repo/</local-p2-repo.url>
 
         <java.version>17</java.version>
+        <java.version.min>11</java.version.min>
         <maven.compiler.source>${java.version}</maven.compiler.source>
         <maven.compiler.target>${java.version}</maven.compiler.target>