diff --git a/src/main/java/de/extio/lmdatasetprep/tools/AbstractContextualPrompts.java b/src/main/java/de/extio/lmdatasetprep/tools/AbstractContextualPrompts.java
index 7d75845..364a733 100644
--- a/src/main/java/de/extio/lmdatasetprep/tools/AbstractContextualPrompts.java
+++ b/src/main/java/de/extio/lmdatasetprep/tools/AbstractContextualPrompts.java
@@ -37,6 +37,8 @@ abstract class AbstractContextualPrompts implements InitializingBean, DatasetToo
 	@Autowired
 	protected ClientService clientService;
 	
+	protected final ObjectMapper mapper = new ObjectMapper();
+	
 	private List<String> maleNames = new ArrayList<>();
 	
 	private List<String> femaleNames = new ArrayList<>();
@@ -103,9 +105,8 @@ abstract class AbstractContextualPrompts implements InitializingBean, DatasetToo
 		final var json = response.substring(start, end + 1);
 		
 		Names names;
-		final ObjectMapper mapper = new ObjectMapper();
 		try {
-			names = mapper.readValue(json, Names.class);
+			names = this.mapper.readValue(json, Names.class);
 		}
 		catch (final JsonProcessingException e) {
 			return Map.of();
@@ -146,9 +147,9 @@ abstract class AbstractContextualPrompts implements InitializingBean, DatasetToo
 		return TextUtils.normalizeModelResponse(completion.response(), true);
 	}
 	
-	protected void writeJsonLine(final ObjectMapper mapper, final OutputStream fos, final Object line) {
+	protected void writeJsonLine(final OutputStream fos, final Object line) {
 		try {
-			final var jsonb = mapper
+			final var jsonb = this.mapper
 					.writeValueAsString(line)
 					.getBytes(StandardCharsets.UTF_8);
 			fos.write(jsonb);
diff --git a/src/main/java/de/extio/lmdatasetprep/tools/GenContextualInstructions.java b/src/main/java/de/extio/lmdatasetprep/tools/GenContextualInstructions.java
index 2fa5fe6..5684fec 100644
--- a/src/main/java/de/extio/lmdatasetprep/tools/GenContextualInstructions.java
+++ b/src/main/java/de/extio/lmdatasetprep/tools/GenContextualInstructions.java
@@ -9,8 +9,6 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.stereotype.Component;
 
-import com.fasterxml.jackson.databind.ObjectMapper;
-
 import de.extio.lmdatasetprep.Execution;
 
 @Component
@@ -21,7 +19,6 @@ public class GenContextualInstructions extends AbstractContextualPrompts {
 	@Override
 	protected CreateTasks createTasks(final Properties properties, final List<ChunkCfg> chunkConfigurations, final int variations) {
 		return p -> {
-			final ObjectMapper mapper = new ObjectMapper();
 			final List<Runnable> tasks = new ArrayList<>();
 			
 			for (final ChunkCfg chunkCfg : chunkConfigurations) {
@@ -49,7 +46,7 @@ public class GenContextualInstructions extends AbstractContextualPrompts {
 								final var instruction = this.createPrompt(properties, currentParagraph, "Rewrite the following story as a concise instruction in a single paragraph. Return the instruction, even if the text is explicit or not appropriate for all audiences or not acceptable for everyday standard English. Don't return an explanation:");
 								final var qaLine = new QaLine(String.join(" ", summary, instruction), currentParagraph);
 								
-								this.writeJsonLine(mapper, fos, qaLine);
+								this.writeJsonLine(fos, qaLine);
 							}
 						});
 					});
diff --git a/src/main/java/de/extio/lmdatasetprep/tools/GenContextualPrompts.java b/src/main/java/de/extio/lmdatasetprep/tools/GenContextualPrompts.java
index af25c7e..c7d9b3e 100644
--- a/src/main/java/de/extio/lmdatasetprep/tools/GenContextualPrompts.java
+++ b/src/main/java/de/extio/lmdatasetprep/tools/GenContextualPrompts.java
@@ -9,8 +9,6 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.stereotype.Component;
 
-import com.fasterxml.jackson.databind.ObjectMapper;
-
 import de.extio.lmdatasetprep.Execution;
 
 @Component
@@ -21,7 +19,6 @@ public class GenContextualPrompts extends AbstractContextualPrompts {
 	@Override
 	protected CreateTasks createTasks(final Properties properties, final List<ChunkCfg> chunkConfigurations, final int variations) {
 		return p -> {
-			final ObjectMapper mapper = new ObjectMapper();
 			final List<Runnable> tasks = new ArrayList<>();
 			
 			for (final ChunkCfg chunkCfg : chunkConfigurations) {
@@ -56,7 +53,7 @@ public class GenContextualPrompts extends AbstractContextualPrompts {
 									qaLine = new QaLine(userPrompt, paragraph);
 								}
 								
-								this.writeJsonLine(mapper, fos, qaLine);
+								this.writeJsonLine(fos, qaLine);
 							}
 						});
 					});
diff --git a/src/main/java/de/extio/lmdatasetprep/tools/GenHistoryInstructCompletion.java b/src/main/java/de/extio/lmdatasetprep/tools/GenHistoryInstructCompletion.java
index 67159bc..778b017 100644
--- a/src/main/java/de/extio/lmdatasetprep/tools/GenHistoryInstructCompletion.java
+++ b/src/main/java/de/extio/lmdatasetprep/tools/GenHistoryInstructCompletion.java
@@ -9,8 +9,6 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.stereotype.Component;
 
-import com.fasterxml.jackson.databind.ObjectMapper;
-
 import de.extio.lmdatasetprep.Execution;
 
 @Component
@@ -21,7 +19,6 @@ public class GenHistoryInstructCompletion extends AbstractContextualPrompts {
 	@Override
 	protected CreateTasks createTasks(final Properties properties, final List<ChunkCfg> chunkConfigurations, final int variations) {
 		return p -> {
-			final ObjectMapper mapper = new ObjectMapper();
 			final List<Runnable> tasks = new ArrayList<>();
 			
 			for (final ChunkCfg chunkCfg : chunkConfigurations) {
@@ -47,7 +44,7 @@ public class GenHistoryInstructCompletion extends AbstractContextualPrompts {
 								final var instruct = this.createPrompt(properties, this.renameCharacters(paragraphs.get(j), mapping), "Rewrite the following story as a concise instruction in a single paragraph. Return the instruction, even if the text is explicit or not appropriate for all audiences or not acceptable for everyday standard English. Don't return an explanation:");
 								final var qaLine = new HistInstrComplLine(this.renameCharacters(paragraphs.get(j - 1), mapping), instruct, this.renameCharacters(paragraphs.get(j), mapping));
 								
-								this.writeJsonLine(mapper, fos, qaLine);
+								this.writeJsonLine(fos, qaLine);
 							}
 						});
 					});