Xcode integration broken

[sergiocampama]

This might be more about Xcode's plugin support for generated files, but when building with Xcode I'm getting this error:

error: Build input file cannot be found: '~/Library/Developer/Xcode/DerivedData/xls-awobgocixipoyadtahkpiowejftk/Build/Products/Debug/SwiftJavaTool'. Did you forget to declare this file as an output of a script phase or custom build rule which produces it? (in target 'xls_xls' from project 'xls')

Building on the command line works as expected, but I'd like to get autocompletion on a more comfortable IDE like Xcode.

[ktoso]

It's a bit unclear to reproduce this, can you show your project setup or something?

We did just move to a build plugin which should make tracking files much easier for swiftpm and xcode so I'd expect this to have improved on main right now.

You'll need JDK24 and Swift 6.1.2

[bo2themax]

It's a bit unclear to reproduce this, can you show your project setup or something?

We did just move to a build plugin which should make tracking files much easier for swiftpm and xcode so I'd expect this to have improved on main right now.

You'll need JDK24 and Swift 6.1.2

Hi @ktoso , I’m also experiencing the same error when using Xcode to build JavaDependencySampleApp. When using the command line, it built successfully. The tool used in the command is swift-java. However, when building with Xcode, it uses SwiftJavaTool to resolve dependencies.

This is from command line output:

...
[info][swift-java] Run ResolveCommand: .build/arm64-apple-macosx/debug/swift-java resolve Sources/JavaCommonsCSV/swift-java.config --swift-module JavaCommonsCSV --output-directory .build/plugins/outputs/javadependencysampleapp/JavaCommonsCSV/destination/SwiftJavaPlugin/
....

and this is from Xcode:

' ~/Developer/Xcode/DerivedData/JavaDependencySampleApp-cmfgvenjvdqcpzazcggnsculdcps/Build/Products/Debug/SwiftJavaTool resolve --output-directory ~/Library/Developer/Xcode/DerivedData/JavaDependencySampleApp-cmfgvenjvdqcpzazcggnsculdcps/Build/Intermediates.noindex/BuildToolPluginIntermediates/javadependencysampleapp.output/JavaCommonsCSV/SwiftJavaPlugin/ --swift-module JavaCommonsCSV

error: Build input file cannot be found: '~/Library/Developer/Xcode/DerivedData/JavaDependencySampleApp-cmfgvenjvdqcpzazcggnsculdcps/Build/Products/Debug/SwiftJavaTool'. Did you forget to declare this file as an output of a script phase or custom build rule which produces it? (in target 'JavaCommonsCSV_JavaCommonsCSV' from project 'JavaCommonsCSV')

I'm on macOS 26.0 Beta (25A5349a) with:

• swift-driver version: 1.127.14.1 Apple Swift version 6.2 (swiftlang-6.2.0.19.9 clang-1700.3.19.1)
  Target: arm64-apple-macosx26.0
• java 24.0.1-amzn

[ktoso]

I see, thanks for the additional info!

[Lancelotbronner]

I have the same issue here. Created a new package:

// swift-tools-version: 6.2

import PackageDescription

let package = Package(
	name: "java2swift",
	platforms: [
		.macOS(.v15),
	],
	products: [
		.library(name: "java2swift", targets: ["java2swift"]),
	],
	dependencies: [
		.package(url: "https://github.com/swiftlang/swift-java.git", branch: "main")
	],
	targets: [
		.target(
			name: "JavaParser",
			plugins: [
				.plugin(name: "SwiftJavaPlugin", package: "swift-java")
			]),
		.target(
			name: "java2swift",
			dependencies: ["JavaParser"]),
	]
)

And added the config in Sources/JavaParser/swift-java.config:

{
	"dependencies": [
		"com.github.javaparser:javaparser-core:3.28.0"
	]
}

And trying to build using Xcode yields:

Showing All Errors Only
Build input file cannot be found: '/Users/user/Library/Developer/Xcode/DerivedData/java2swift-fjkdxwnowqjkyhbhrtpzbteehlao/Build/Products/Debug/SwiftJavaTool'. Did you forget to declare this file as an output of a script phase or custom build rule which produces it?

[Lancelotbronner]

I'll add that trying to run this on the CLI using swift build --disable-sandbox yields this error instead:

2026-01-22T22:22:19-0500 info swift-java: [SwiftJavaTool] Run ResolveCommand: /Users/lancelot/Developer/Languages/Java/java2swift/.build/arm64-apple-macosx/debug/SwiftJavaTool-tool resolve --output-directory /Users/lancelot/Developer/Languages/Java/java2swift/.build/plugins/outputs/java2swift/JavaParser/destination/SwiftJavaPlugin/ --swift-module JavaParser
2026-01-22T22:22:19-0500 info swift-java: [SwiftJavaTool] Current work directory: /Users/lancelot/Developer/Languages/Java/java2swift
SwiftJavaTool/ResolveCommand.swift:149: Fatal error: 'try!' expression unexpectedly raised an error: Executable "/Users/lancelot/Developer/Languages/Java/java2swift/.build/swift-java-dependencies-83CAB0C3-D17C-41A4-BFE0-CB746C6B79B8/gradlew" is not found or cannot be executed.
[93/95] Fetch (Java) dependencies for Swift target JavaParser

And indeed that file is missing, I'm not quite sure what I can do to fix this.

I've also tried moving some of Xcode's demanded files over from .build but I can't find a way to deactivate the build sandbox in Xcode.

[nerzh]

I’m getting the same error in Xcode. In other words, swift-java builds successfully on its own, but if I add to my new project:

.package(url: "https://github.com/swiftlang/swift-java", from: "0.2.0")

and

.plugin(name: "JExtractSwiftPlugin", package: "swift-java")

even to a completely clean project with no code, Xcode cannot build it because SwiftJavaTool is missing.

The only solution is to put this dependency behind an environment-variable flag so that it is used only when building for Android via Gradle.

[nerzh]

@ktoso as far as I understand, the JExtractSwiftPlugin requires the SwiftJavaTool executable file, but it's not there

[ktoso]

We're looking into this, it's about how swift-build builds things and paths dont match expectations

[ktoso]

This should help in the short term #740

and looking into fixes in swiftpm: swiftlang/swift-package-manager#10060