Start field

Author: jrosen081

Sources/JavaKitMacros/JavaFieldMacro.swift

@@ -33,6 +33,11 @@ extension JavaFieldMacro: AccessorMacro {
       return []
     }
 
+    let isStatic = node.attributeName.trimmedDescription == "JavaStaticMethod"
+    guard !isStatic || isInStaticContext(context: context) else {
+      throw MacroExpansionErrorMessage("Cannot use @JavaStaticMethod outside of a JavaClass instance")
+    }
+
     // Dig out the Java field name, if provided. Otherwise, use the name as written.
     let fieldName =
       if case .argumentList(let arguments) = node.arguments,
@@ -79,4 +84,18 @@ extension JavaFieldMacro: AccessorMacro {
 
     return accessors
   }
+
+  private static func isInStaticContext(context: some MacroExpansionContext) -> Bool {
+    for lexicalContext in context.lexicalContext {
+      if let classSyntax = lexicalContext.as(StructDeclSyntax.self) {
+        if classSyntax.name.trimmedDescription.starts(with: "JavaClass") {
+          return true
+        } else {
+          return false
+        }
+      }
+    }
+
+    return false
+  }
 }

Tests/JavaKitMacroTests/JavaClassMacroTests.swift

@@ -26,6 +26,25 @@ class JavaKitMacroTests: XCTestCase {
     "JavaField": JavaFieldMacro.self
   ]
 
+  func testJavaStaticMethodFailure() throws {
+    assertMacroExpansion(
+      """
+        @JavaClass("org.swift.example.HelloWorld")
+        public struct HelloWorld {
+          @JavaStaticMethod
+          public init(environment: JNIEnvironment? = nil)
+        }
+      """,
+      expandedSource: """
+
+        public struct HelloWorld {
+        }
+      """,
+      diagnostics: [DiagnosticSpec(message: "", line: 0, column: 0)],
+      macros: Self.javaKitMacros
+    )
+  }
+
   func testJavaClass() throws {
     assertMacroExpansion("""
         @JavaClass("org.swift.example.HelloWorld")