diff --git a/.gitignore b/.gitignore
index d48099830..ad9544f57 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,6 +5,8 @@
 *~
 /build/shared/reference.zip
 
+*.x
+
 # temporary, until we complete the move to IntelliJ
 *.iml
 /.idea
diff --git a/app/.classpath b/app/.classpath
index 2ad9471a8..df37d3bba 100644
--- a/app/.classpath
+++ b/app/.classpath
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <classpath>
 	<classpathentry kind="src" path="src"/>
-	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.launching.macosx.MacOSXType/AdoptOpenJDK 11 [11.0.6]">
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/adoptopenjdk-11">
 		<attributes>
 			<attribute name="module" value="true"/>
 		</attributes>
diff --git a/build/jre/.classpath b/build/jre/.classpath
index bb6066c5c..a95e6b974 100644
--- a/build/jre/.classpath
+++ b/build/jre/.classpath
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <classpath>
 	<classpathentry kind="src" path="src"/>
-	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-11">
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/adoptopenjdk-11">
 		<attributes>
 			<attribute name="module" value="true"/>
 		</attributes>
diff --git a/build/macosx/appbundler/.classpath b/build/macosx/appbundler/.classpath
index 7ab586c75..3124990b4 100644
--- a/build/macosx/appbundler/.classpath
+++ b/build/macosx/appbundler/.classpath
@@ -1,7 +1,11 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <classpath>
 	<classpathentry kind="src" path="src"/>
-	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/adoptopenjdk-11">
+		<attributes>
+			<attribute name="module" value="true"/>
+		</attributes>
+	</classpathentry>
 	<classpathentry combineaccessrules="false" kind="src" path="/processing4-app"/>
 	<classpathentry kind="output" path="bin"/>
 </classpath>
diff --git a/core/.classpath b/core/.classpath
index c42dc4877..e8525451f 100644
--- a/core/.classpath
+++ b/core/.classpath
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <classpath>
 	<classpathentry kind="src" path="src"/>
-	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.launching.macosx.MacOSXType/AdoptOpenJDK 11 [11.0.6]">
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/adoptopenjdk-11">
 		<attributes>
 			<attribute name="module" value="true"/>
 		</attributes>
diff --git a/java/.classpath b/java/.classpath
index bf7463bae..424f58996 100644
--- a/java/.classpath
+++ b/java/.classpath
@@ -4,7 +4,7 @@
 	<classpathentry kind="src" path="src"/>
 	<classpathentry combineaccessrules="false" kind="src" path="/processing4-app"/>
 	<classpathentry combineaccessrules="false" kind="src" path="/processing4-core"/>
-	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.launching.macosx.MacOSXType/AdoptOpenJDK 11 [11.0.6]">
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/adoptopenjdk-11">
 		<attributes>
 			<attribute name="module" value="true"/>
 		</attributes>
diff --git a/java/libraries/dxf/.classpath b/java/libraries/dxf/.classpath
index 401bffc1c..4e243c7a4 100644
--- a/java/libraries/dxf/.classpath
+++ b/java/libraries/dxf/.classpath
@@ -1,7 +1,11 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <classpath>
 	<classpathentry kind="src" path="src"/>
-	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/adoptopenjdk-11">
+		<attributes>
+			<attribute name="module" value="true"/>
+		</attributes>
+	</classpathentry>
 	<classpathentry combineaccessrules="false" kind="src" path="/processing4-core"/>
 	<classpathentry kind="output" path="bin"/>
 </classpath>
diff --git a/java/libraries/dxf/.settings/org.eclipse.jdt.core.prefs b/java/libraries/dxf/.settings/org.eclipse.jdt.core.prefs
index 87b7a7a3a..cd8d089a1 100644
--- a/java/libraries/dxf/.settings/org.eclipse.jdt.core.prefs
+++ b/java/libraries/dxf/.settings/org.eclipse.jdt.core.prefs
@@ -1,13 +1,15 @@
 eclipse.preferences.version=1
 org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
 org.eclipse.jdt.core.compiler.codegen.methodParameters=do not generate
-org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=11
 org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
-org.eclipse.jdt.core.compiler.compliance=1.8
+org.eclipse.jdt.core.compiler.compliance=11
 org.eclipse.jdt.core.compiler.debug.lineNumber=generate
 org.eclipse.jdt.core.compiler.debug.localVariable=generate
 org.eclipse.jdt.core.compiler.debug.sourceFile=generate
 org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
+org.eclipse.jdt.core.compiler.problem.enablePreviewFeatures=disabled
 org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
+org.eclipse.jdt.core.compiler.problem.reportPreviewFeatures=warning
 org.eclipse.jdt.core.compiler.release=disabled
-org.eclipse.jdt.core.compiler.source=1.8
+org.eclipse.jdt.core.compiler.source=11
diff --git a/java/libraries/net/.classpath b/java/libraries/net/.classpath
index f6dcc7d46..c45131f2e 100644
--- a/java/libraries/net/.classpath
+++ b/java/libraries/net/.classpath
@@ -2,6 +2,10 @@
 <classpath>
 	<classpathentry kind="src" path="src"/>
 	<classpathentry combineaccessrules="false" kind="src" path="/processing4-core"/>
-	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/adoptopenjdk-11">
+		<attributes>
+			<attribute name="module" value="true"/>
+		</attributes>
+	</classpathentry>
 	<classpathentry kind="output" path="bin"/>
 </classpath>
diff --git a/java/libraries/net/.settings/org.eclipse.jdt.core.prefs b/java/libraries/net/.settings/org.eclipse.jdt.core.prefs
index f256b10aa..7fd972bc9 100644
--- a/java/libraries/net/.settings/org.eclipse.jdt.core.prefs
+++ b/java/libraries/net/.settings/org.eclipse.jdt.core.prefs
@@ -1,16 +1,18 @@
 eclipse.preferences.version=1
 org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
 org.eclipse.jdt.core.compiler.codegen.methodParameters=do not generate
-org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=11
 org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
-org.eclipse.jdt.core.compiler.compliance=1.8
+org.eclipse.jdt.core.compiler.compliance=11
 org.eclipse.jdt.core.compiler.debug.lineNumber=generate
 org.eclipse.jdt.core.compiler.debug.localVariable=generate
 org.eclipse.jdt.core.compiler.debug.sourceFile=generate
 org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
+org.eclipse.jdt.core.compiler.problem.enablePreviewFeatures=disabled
 org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
+org.eclipse.jdt.core.compiler.problem.reportPreviewFeatures=warning
 org.eclipse.jdt.core.compiler.release=disabled
-org.eclipse.jdt.core.compiler.source=1.8
+org.eclipse.jdt.core.compiler.source=11
 org.eclipse.jdt.core.formatter.align_type_members_on_columns=false
 org.eclipse.jdt.core.formatter.alignment_for_arguments_in_allocation_expression=18
 org.eclipse.jdt.core.formatter.alignment_for_arguments_in_annotation=0
diff --git a/java/libraries/pdf/.classpath b/java/libraries/pdf/.classpath
index 472fa576c..3cbcec3b2 100644
--- a/java/libraries/pdf/.classpath
+++ b/java/libraries/pdf/.classpath
@@ -1,7 +1,11 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <classpath>
 	<classpathentry kind="src" path="src"/>
-	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/adoptopenjdk-11">
+		<attributes>
+			<attribute name="module" value="true"/>
+		</attributes>
+	</classpathentry>
 	<classpathentry kind="lib" path="library/itext.jar" sourcepath="itext-src.zip"/>
 	<classpathentry combineaccessrules="false" kind="src" path="/processing4-core"/>
 	<classpathentry kind="output" path="bin"/>
diff --git a/java/libraries/pdf/.settings/org.eclipse.jdt.core.prefs b/java/libraries/pdf/.settings/org.eclipse.jdt.core.prefs
index 02a284792..18ca3e41b 100644
--- a/java/libraries/pdf/.settings/org.eclipse.jdt.core.prefs
+++ b/java/libraries/pdf/.settings/org.eclipse.jdt.core.prefs
@@ -1,16 +1,18 @@
 eclipse.preferences.version=1
 org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
 org.eclipse.jdt.core.compiler.codegen.methodParameters=do not generate
-org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=11
 org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
-org.eclipse.jdt.core.compiler.compliance=1.8
+org.eclipse.jdt.core.compiler.compliance=11
 org.eclipse.jdt.core.compiler.debug.lineNumber=generate
 org.eclipse.jdt.core.compiler.debug.localVariable=generate
 org.eclipse.jdt.core.compiler.debug.sourceFile=generate
 org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
+org.eclipse.jdt.core.compiler.problem.enablePreviewFeatures=disabled
 org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
+org.eclipse.jdt.core.compiler.problem.reportPreviewFeatures=warning
 org.eclipse.jdt.core.compiler.release=disabled
-org.eclipse.jdt.core.compiler.source=1.8
+org.eclipse.jdt.core.compiler.source=11
 org.eclipse.jdt.core.formatter.align_assignment_statements_on_columns=false
 org.eclipse.jdt.core.formatter.align_fields_grouping_blank_lines=2147483647
 org.eclipse.jdt.core.formatter.align_type_members_on_columns=false
diff --git a/java/libraries/serial/.classpath b/java/libraries/serial/.classpath
index 1df855d0d..bc1607f28 100644
--- a/java/libraries/serial/.classpath
+++ b/java/libraries/serial/.classpath
@@ -1,7 +1,11 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <classpath>
 	<classpathentry kind="src" path="src"/>
-	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/adoptopenjdk-11">
+		<attributes>
+			<attribute name="module" value="true"/>
+		</attributes>
+	</classpathentry>
 	<classpathentry kind="lib" path="library/jssc.jar"/>
 	<classpathentry combineaccessrules="false" kind="src" path="/processing4-core"/>
 	<classpathentry kind="output" path="bin"/>
diff --git a/java/libraries/serial/.settings/org.eclipse.jdt.core.prefs b/java/libraries/serial/.settings/org.eclipse.jdt.core.prefs
index 87b7a7a3a..cd8d089a1 100644
--- a/java/libraries/serial/.settings/org.eclipse.jdt.core.prefs
+++ b/java/libraries/serial/.settings/org.eclipse.jdt.core.prefs
@@ -1,13 +1,15 @@
 eclipse.preferences.version=1
 org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
 org.eclipse.jdt.core.compiler.codegen.methodParameters=do not generate
-org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=11
 org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
-org.eclipse.jdt.core.compiler.compliance=1.8
+org.eclipse.jdt.core.compiler.compliance=11
 org.eclipse.jdt.core.compiler.debug.lineNumber=generate
 org.eclipse.jdt.core.compiler.debug.localVariable=generate
 org.eclipse.jdt.core.compiler.debug.sourceFile=generate
 org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
+org.eclipse.jdt.core.compiler.problem.enablePreviewFeatures=disabled
 org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
+org.eclipse.jdt.core.compiler.problem.reportPreviewFeatures=warning
 org.eclipse.jdt.core.compiler.release=disabled
-org.eclipse.jdt.core.compiler.source=1.8
+org.eclipse.jdt.core.compiler.source=11