diff --git a/testdata/java/light/pom.xml b/testdata/java/light/pom.xml
index 074bd0d3..f1f2b52c 100644
--- a/testdata/java/light/pom.xml
+++ b/testdata/java/light/pom.xml
@@ -9,6 +9,7 @@
 	<properties>
 		<maven.compiler.target>11</maven.compiler.target>
 		<maven.compiler.source>11</maven.compiler.source>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 	</properties>
 	<build>
 		<plugins>
diff --git a/testdata/java/mistakes/importMissing/pom.xml b/testdata/java/mistakes/importMissing/pom.xml
index d019e5d6..07e0ec50 100644
--- a/testdata/java/mistakes/importMissing/pom.xml
+++ b/testdata/java/mistakes/importMissing/pom.xml
@@ -10,6 +10,7 @@
 	<properties>
 		<maven.compiler.source>11</maven.compiler.source>
 		<maven.compiler.target>11</maven.compiler.target>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 	</properties>
 
 	<build>
diff --git a/testdata/java/mistakes/openingBracketMissing/pom.xml b/testdata/java/mistakes/openingBracketMissing/pom.xml
index 47d7df9d..c4331be3 100644
--- a/testdata/java/mistakes/openingBracketMissing/pom.xml
+++ b/testdata/java/mistakes/openingBracketMissing/pom.xml
@@ -10,6 +10,7 @@
 	<properties>
 		<maven.compiler.source>11</maven.compiler.source>
 		<maven.compiler.target>11</maven.compiler.target>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 	</properties>
 
 	<build>
diff --git a/testdata/java/mistakes/syntaxErrorTypeMissing/pom.xml b/testdata/java/mistakes/syntaxErrorTypeMissing/pom.xml
index 6aa0f167..10e0b27c 100644
--- a/testdata/java/mistakes/syntaxErrorTypeMissing/pom.xml
+++ b/testdata/java/mistakes/syntaxErrorTypeMissing/pom.xml
@@ -10,6 +10,7 @@
 	<properties>
 		<maven.compiler.source>11</maven.compiler.source>
 		<maven.compiler.target>11</maven.compiler.target>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 	</properties>
 
 	<build>
diff --git a/testdata/java/mistakes/typeUnknown/pom.xml b/testdata/java/mistakes/typeUnknown/pom.xml
index 95557950..04f6f0fe 100644
--- a/testdata/java/mistakes/typeUnknown/pom.xml
+++ b/testdata/java/mistakes/typeUnknown/pom.xml
@@ -10,6 +10,7 @@
 	<properties>
 		<maven.compiler.source>11</maven.compiler.source>
 		<maven.compiler.target>11</maven.compiler.target>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 	</properties>
 
 	<build>
diff --git a/testdata/java/mistakes/variableUnknown/pom.xml b/testdata/java/mistakes/variableUnknown/pom.xml
index 9209d0fd..8266558a 100644
--- a/testdata/java/mistakes/variableUnknown/pom.xml
+++ b/testdata/java/mistakes/variableUnknown/pom.xml
@@ -10,6 +10,7 @@
 	<properties>
 		<maven.compiler.source>11</maven.compiler.source>
 		<maven.compiler.target>11</maven.compiler.target>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 	</properties>
 
 	<build>
diff --git a/testdata/java/plain/pom.xml b/testdata/java/plain/pom.xml
index d24b0424..ad5b76ea 100644
--- a/testdata/java/plain/pom.xml
+++ b/testdata/java/plain/pom.xml
@@ -9,6 +9,7 @@
 	<properties>
 		<maven.compiler.target>11</maven.compiler.target>
 		<maven.compiler.source>11</maven.compiler.source>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 	</properties>
 	<build>
 		<plugins>
diff --git a/testdata/java/transpile/balancedBrackets/pom.xml b/testdata/java/transpile/balancedBrackets/pom.xml
index bcd859f4..f86dcfe5 100644
--- a/testdata/java/transpile/balancedBrackets/pom.xml
+++ b/testdata/java/transpile/balancedBrackets/pom.xml
@@ -9,6 +9,7 @@
 	<properties>
 		<maven.compiler.target>11</maven.compiler.target>
 		<maven.compiler.source>11</maven.compiler.source>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 	</properties>
 	<build>
 		<plugins>
diff --git a/testdata/java/transpile/binarySearch/pom.xml b/testdata/java/transpile/binarySearch/pom.xml
index f9205cc3..fcdd1ce5 100644
--- a/testdata/java/transpile/binarySearch/pom.xml
+++ b/testdata/java/transpile/binarySearch/pom.xml
@@ -9,6 +9,7 @@
 	<properties>
 		<maven.compiler.target>11</maven.compiler.target>
 		<maven.compiler.source>11</maven.compiler.source>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 	</properties>
 	<build>
 		<plugins>
diff --git a/testdata/java/transpile/cascadingIfElse/pom.xml b/testdata/java/transpile/cascadingIfElse/pom.xml
index 30a8d972..4c2edc60 100644
--- a/testdata/java/transpile/cascadingIfElse/pom.xml
+++ b/testdata/java/transpile/cascadingIfElse/pom.xml
@@ -9,6 +9,7 @@
 	<properties>
 		<maven.compiler.target>11</maven.compiler.target>
 		<maven.compiler.source>11</maven.compiler.source>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 	</properties>
 	<build>
 		<plugins>
diff --git a/testdata/java/transpile/isSorted/pom.xml b/testdata/java/transpile/isSorted/pom.xml
index ef045745..01efff02 100644
--- a/testdata/java/transpile/isSorted/pom.xml
+++ b/testdata/java/transpile/isSorted/pom.xml
@@ -9,6 +9,7 @@
 	<properties>
 		<maven.compiler.target>11</maven.compiler.target>
 		<maven.compiler.source>11</maven.compiler.source>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 	</properties>
 	<build>
 		<plugins>
diff --git a/testdata/java/transpile/pascalsTriangle/pom.xml b/testdata/java/transpile/pascalsTriangle/pom.xml
index 30a8d972..4c2edc60 100644
--- a/testdata/java/transpile/pascalsTriangle/pom.xml
+++ b/testdata/java/transpile/pascalsTriangle/pom.xml
@@ -9,6 +9,7 @@
 	<properties>
 		<maven.compiler.target>11</maven.compiler.target>
 		<maven.compiler.source>11</maven.compiler.source>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 	</properties>
 	<build>
 		<plugins>