add license headers

common/api/inject/src/main/java/com/dfsek/terra/api/inject/Injector.java

@@ -1,3 +1,10 @@
+/*
+ * Copyright (c) 2020-2021 Polyhedral Development
+ *
+ * The Terra API is licensed under the terms of the MIT License. For more details,
+ * reference the LICENSE file in the common/api directory.
+ */
+
 package com.dfsek.terra.api.inject;
 
 import com.dfsek.terra.api.inject.annotations.Inject;

common/api/inject/src/main/java/com/dfsek/terra/api/inject/annotations/Inject.java

@@ -1,3 +1,10 @@
+/*
+ * Copyright (c) 2020-2021 Polyhedral Development
+ *
+ * The Terra API is licensed under the terms of the MIT License. For more details,
+ * reference the LICENSE file in the common/api directory.
+ */
+
 package com.dfsek.terra.api.inject.annotations;
 
 import java.lang.annotation.ElementType;

common/api/inject/src/main/java/com/dfsek/terra/api/inject/exception/InjectionException.java

@@ -1,12 +1,22 @@
+/*
+ * Copyright (c) 2020-2021 Polyhedral Development
+ *
+ * The Terra API is licensed under the terms of the MIT License. For more details,
+ * reference the LICENSE file in the common/api directory.
+ */
+
 package com.dfsek.terra.api.inject.exception;
 
 import com.dfsek.terra.api.inject.Injector;
 
+import java.io.Serial;
+
 
 /**
  * Thrown when dynamic dependency injection cannot be completed by an {@link Injector}.
  */
 public class InjectionException extends RuntimeException {
+    @Serial
     private static final long serialVersionUID = -6929631447064215387L;
     
     public InjectionException(String message) {

common/api/inject/src/main/java/com/dfsek/terra/api/inject/impl/InjectorImpl.java

@@ -1,3 +1,10 @@
+/*
+ * Copyright (c) 2020-2021 Polyhedral Development
+ *
+ * The Terra API is licensed under the terms of the MIT License. For more details,
+ * reference the LICENSE file in the common/api directory.
+ */
+
 package com.dfsek.terra.api.inject.impl;
 
 import java.lang.reflect.Field;