diff --git a/org.eclipse.tm4e.core/src/main/java/org/eclipse/tm4e/core/internal/oniguruma/OnigRegExp.java b/org.eclipse.tm4e.core/src/main/java/org/eclipse/tm4e/core/internal/oniguruma/OnigRegExp.java
index 15664c64e..a527d214b 100644
--- a/org.eclipse.tm4e.core/src/main/java/org/eclipse/tm4e/core/internal/oniguruma/OnigRegExp.java
+++ b/org.eclipse.tm4e.core/src/main/java/org/eclipse/tm4e/core/internal/oniguruma/OnigRegExp.java
@@ -18,7 +18,7 @@
 
 package org.eclipse.tm4e.core.internal.oniguruma;
 
-import java.io.UnsupportedEncodingException;
+import java.nio.charset.StandardCharsets;
 
 import org.jcodings.specific.UTF8Encoding;
 import org.joni.Matcher;
@@ -44,12 +44,7 @@ public OnigRegExp(String source) {
 		lastSearchStrUniqueId = null;
 		lastSearchPosition = -1;
 		lastSearchResult = null;
-		byte[] pattern;
-		try {
-			pattern = source.getBytes("utf-8");
-		} catch (UnsupportedEncodingException e) {
-			throw new RuntimeException(e);
-		}
+		byte[] pattern = source.getBytes(StandardCharsets.UTF_8);
 		this.regex = new Regex(pattern, 0, pattern.length, Option.CAPTURE_GROUP, UTF8Encoding.INSTANCE, Syntax.DEFAULT,
 				WarnCallback.DEFAULT);
 	}
diff --git a/org.eclipse.tm4e.core/src/main/java/org/eclipse/tm4e/core/internal/oniguruma/OnigString.java b/org.eclipse.tm4e.core/src/main/java/org/eclipse/tm4e/core/internal/oniguruma/OnigString.java
index 448566144..233a8df53 100644
--- a/org.eclipse.tm4e.core/src/main/java/org/eclipse/tm4e/core/internal/oniguruma/OnigString.java
+++ b/org.eclipse.tm4e.core/src/main/java/org/eclipse/tm4e/core/internal/oniguruma/OnigString.java
@@ -17,7 +17,7 @@
 
 package org.eclipse.tm4e.core.internal.oniguruma;
 
-import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
 
 /**
  * Oniguruma string.
@@ -27,15 +27,13 @@
  */
 public class OnigString {
 
-	private static final String UTF_8 = "UTF-8";
-
 	private final String str;
 	private byte[] value;
 	private Object uniqueId;
 
 	public OnigString(String str) {
 		this.str = str;
-		this.value = str.getBytes(Charset.forName(UTF_8));
+		this.value = str.getBytes(StandardCharsets.UTF_8);
 		this.uniqueId = new Object();
 	}
 
diff --git a/org.eclipse.tm4e.core/src/main/java/org/eclipse/tm4e/core/internal/parser/json/JSONPListParser.java b/org.eclipse.tm4e.core/src/main/java/org/eclipse/tm4e/core/internal/parser/json/JSONPListParser.java
index fa079df66..4878d65c4 100644
--- a/org.eclipse.tm4e.core/src/main/java/org/eclipse/tm4e/core/internal/parser/json/JSONPListParser.java
+++ b/org.eclipse.tm4e.core/src/main/java/org/eclipse/tm4e/core/internal/parser/json/JSONPListParser.java
@@ -13,6 +13,7 @@
 import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
 
 import org.eclipse.tm4e.core.internal.parser.PList;
 
@@ -29,7 +30,7 @@ public JSONPListParser(boolean theme) {
 
 	public T parse(InputStream contents) throws Exception {
 		PList<T> pList = new PList<T>(theme);
-		JsonReader reader = new JsonReader(new InputStreamReader(contents, Charset.forName("UTF-8")));
+		JsonReader reader = new JsonReader(new InputStreamReader(contents, StandardCharsets.UTF_8));
 		// reader.setLenient(true);
 		boolean parsing = true;
 		while (parsing) {