diff --git a/lib/src/main/java/com/diffplug/spotless/ProcessRunner.java b/lib/src/main/java/com/diffplug/spotless/ProcessRunner.java
index 48307d7d3..f110207e3 100644
--- a/lib/src/main/java/com/diffplug/spotless/ProcessRunner.java
+++ b/lib/src/main/java/com/diffplug/spotless/ProcessRunner.java
@@ -163,7 +163,6 @@ public class ProcessRunner implements AutoCloseable {
 		}
 		// write stdin
 		process.getOutputStream().write(stdin);
-		process.getOutputStream().close();
 		return new LongRunningProcess(process, args, outputFut, errorFut);
 	}
 
diff --git a/plugin-gradle/src/test/java/com/diffplug/gradle/spotless/BufIntegrationTest.java b/plugin-gradle/src/test/java/com/diffplug/gradle/spotless/BufIntegrationTest.java
index b91512c7e..0411d5776 100644
--- a/plugin-gradle/src/test/java/com/diffplug/gradle/spotless/BufIntegrationTest.java
+++ b/plugin-gradle/src/test/java/com/diffplug/gradle/spotless/BufIntegrationTest.java
@@ -23,6 +23,74 @@ import com.diffplug.spotless.tag.BufTest;
 
 @BufTest
 class BufIntegrationTest extends GradleIntegrationHarness {
+	@Test
+	void bufFromMaven() throws IOException {
+		setFile("build.gradle").toLines(
+				"plugins {",
+				"  id 'com.diffplug.spotless'",
+				"}",
+				"repositories { mavenCentral() }",
+				"def getBufClassifier() {",
+				"  def osName = System.getProperty(\"os.name\").toLowerCase()",
+				"  def os = \"\"",
+				"  switch (osName) {",
+				"    case { it.startsWith(\"windows\") }:",
+				"      os = \"windows\"",
+				"      break",
+				"  	case { it.startsWith(\"linux\") }:",
+				"     os = \"linux\"",
+				"     break",
+				"  	case { it.startsWith(\"mac\") }:",
+				"     os = \"osx\"",
+				"     break",
+				"  	default:",
+				"     throw new GradleException(\"Unsupported OS: $osName\")",
+				"  }",
+				"  def arch = \"\"",
+				"  switch (System.getProperty(\"os.arch\").toLowerCase()) {",
+				"    case { it.startsWith(\"x86_64\") || it.startsWith(\"amd64\") }:",
+				"      arch = \"x86_64\"",
+				"      break",
+				"  	case { it.startsWith(\"arm64\") || it.startsWith(\"aarch64\") }:",
+				"      arch = \"aarch_64\"",
+				"      break",
+				"  	default:",
+				"      throw new GradleException(\"Unsupported architecture: ${it}\")",
+				"  }",
+				"  return \"$os-$arch\"",
+				"}",
+				"configurations { localBuf {} }",
+				"dependencies {",
+				"  localBuf group: \"build.buf\", name: \"buf\", version: \"1.31.0\", ext: \"exe\", classifier: getBufClassifier(), transitive: false",
+				"}",
+				"spotless {",
+				"  protobuf {",
+				"    def bufExe = configurations.localBuf.singleFile",
+				"    if (!bufExe.canExecute()) bufExe.setExecutable(true)",
+				"    buf(\"1.31.0\").pathToExe(bufExe.absolutePath)",
+				"  }",
+				"}");
+		setFile("buf.proto").toResource("protobuf/buf/buf.proto");
+		gradleRunner().withArguments("spotlessApply").build();
+		assertFile("buf.proto").sameAsResource("protobuf/buf/buf.proto.clean");
+	}
+
+	@Test
+	void bufLarge() throws IOException {
+		setFile("build.gradle").toLines(
+				"plugins {",
+				"  id 'com.diffplug.spotless'",
+				"}",
+				"spotless {",
+				"  protobuf {",
+				"    buf(\"1.31.0\")",
+				"  }",
+				"}");
+		setFile("buf.proto").toResource("protobuf/buf/buf_large.proto");
+		gradleRunner().withArguments("spotlessApply").build();
+		assertFile("buf.proto").sameAsResource("protobuf/buf/buf_large.proto.clean");
+	}
+
 	@Test
 	void buf() throws IOException {
 		setFile("build.gradle").toLines(
@@ -31,7 +99,7 @@ class BufIntegrationTest extends GradleIntegrationHarness {
 				"}",
 				"spotless {",
 				"  protobuf {",
-				"    buf()",
+				"    buf(\"1.31.0\")",
 				"  }",
 				"}");
 		setFile("buf.proto").toResource("protobuf/buf/buf.proto");
@@ -47,7 +115,7 @@ class BufIntegrationTest extends GradleIntegrationHarness {
 				"}",
 				"spotless {",
 				"  protobuf {",
-				"    buf()",
+				"    buf(\"1.31.0\")",
 				"    licenseHeader '/* (C) 2022 */'",
 				"  }",
 				"}");
diff --git a/testlib/src/main/resources/protobuf/buf/buf_large.proto b/testlib/src/main/resources/protobuf/buf/buf_large.proto
new file mode 100644
index 000000000..151c7f4bf
--- /dev/null
+++ b/testlib/src/main/resources/protobuf/buf/buf_large.proto
@@ -0,0 +1,229 @@
+syntax = "proto3";
+
+package com.diffplug.gradle.spotless.buf.proto;
+
+option java_multiple_files = true;
+
+message Message {
+  string message = 1;
+}
+
+service Services {
+rpc Echo(Message) returns (Message);
+}
+
+message Message01 {
+  string message1 = 1;
+  string message2 = 2;
+  string message3 = 3;
+  string message4 = 4;
+  string message5 = 5;
+  string message6 = 6;
+  string message7 = 7;
+  string message8 = 8;
+  string message9 = 9;
+}
+
+message Message02 {
+  string message1 = 1;
+  string message2 = 2;
+  string message3 = 3;
+  string message4 = 4;
+  string message5 = 5;
+  string message6 = 6;
+  string message7 = 7;
+  string message8 = 8;
+  string message9 = 9;
+}
+
+message Message03 {
+  string message1 = 1;
+  string message2 = 2;
+  string message3 = 3;
+  string message4 = 4;
+  string message5 = 5;
+  string message6 = 6;
+  string message7 = 7;
+  string message8 = 8;
+  string message9 = 9;
+}
+
+message Message04 {
+  string message1 = 1;
+  string message2 = 2;
+  string message3 = 3;
+  string message4 = 4;
+  string message5 = 5;
+  string message6 = 6;
+  string message7 = 7;
+  string message8 = 8;
+  string message9 = 9;
+}
+
+message Message05 {
+  string message1 = 1;
+  string message2 = 2;
+  string message3 = 3;
+  string message4 = 4;
+  string message5 = 5;
+  string message6 = 6;
+  string message7 = 7;
+  string message8 = 8;
+  string message9 = 9;
+}
+
+message Message06 {
+  string message1 = 1;
+  string message2 = 2;
+  string message3 = 3;
+  string message4 = 4;
+  string message5 = 5;
+  string message6 = 6;
+  string message7 = 7;
+  string message8 = 8;
+  string message9 = 9;
+}
+
+message Message07 {
+  string message1 = 1;
+  string message2 = 2;
+  string message3 = 3;
+  string message4 = 4;
+  string message5 = 5;
+  string message6 = 6;
+  string message7 = 7;
+  string message8 = 8;
+  string message9 = 9;
+}
+
+message Message08 {
+  string message1 = 1;
+  string message2 = 2;
+  string message3 = 3;
+  string message4 = 4;
+  string message5 = 5;
+  string message6 = 6;
+  string message7 = 7;
+  string message8 = 8;
+  string message9 = 9;
+}
+
+message Message09 {
+  string message1 = 1;
+  string message2 = 2;
+  string message3 = 3;
+  string message4 = 4;
+  string message5 = 5;
+  string message6 = 6;
+  string message7 = 7;
+  string message8 = 8;
+  string message9 = 9;
+}
+
+message Message10 {
+  string message1 = 1;
+  string message2 = 2;
+  string message3 = 3;
+  string message4 = 4;
+  string message5 = 5;
+  string message6 = 6;
+  string message7 = 7;
+  string message8 = 8;
+  string message9 = 9;
+}
+
+message Message11 {
+  string message1 = 1;
+  string message2 = 2;
+  string message3 = 3;
+  string message4 = 4;
+  string message5 = 5;
+  string message6 = 6;
+  string message7 = 7;
+  string message8 = 8;
+  string message9 = 9;
+}
+
+message Message12 {
+  string message1 = 1;
+  string message2 = 2;
+  string message3 = 3;
+  string message4 = 4;
+  string message5 = 5;
+  string message6 = 6;
+  string message7 = 7;
+  string message8 = 8;
+  string message9 = 9;
+}
+
+message Message13 {
+  string message1 = 1;
+  string message2 = 2;
+  string message3 = 3;
+  string message4 = 4;
+  string message5 = 5;
+  string message6 = 6;
+  string message7 = 7;
+  string message8 = 8;
+  string message9 = 9;
+}
+
+message Message14 {
+  string message1 = 1;
+  string message2 = 2;
+  string message3 = 3;
+  string message4 = 4;
+  string message5 = 5;
+  string message6 = 6;
+  string message7 = 7;
+  string message8 = 8;
+  string message9 = 9;
+}
+
+message Message15 {
+  string message1 = 1;
+  string message2 = 2;
+  string message3 = 3;
+  string message4 = 4;
+  string message5 = 5;
+  string message6 = 6;
+  string message7 = 7;
+  string message8 = 8;
+  string message9 = 9;
+}
+
+message Message16 {
+  string message1 = 1;
+  string message2 = 2;
+  string message3 = 3;
+  string message4 = 4;
+  string message5 = 5;
+  string message6 = 6;
+  string message7 = 7;
+  string message8 = 8;
+  string message9 = 9;
+}
+
+message Message17 {
+  string message1 = 1;
+  string message2 = 2;
+  string message3 = 3;
+  string message4 = 4;
+  string message5 = 5;
+  string message6 = 6;
+  string message7 = 7;
+  string message8 = 8;
+  string message9 = 9;
+}
+
+message Message18 {
+  string message1 = 1;
+  string message2 = 2;
+  string message3 = 3;
+  string message4 = 4;
+  string message5 = 5;
+  string message6 = 6;
+  string message7 = 7;
+  string message8 = 8;
+  string message9 = 9;
+}
diff --git a/testlib/src/main/resources/protobuf/buf/buf_large.proto.clean b/testlib/src/main/resources/protobuf/buf/buf_large.proto.clean
new file mode 100644
index 000000000..c4218adfc
--- /dev/null
+++ b/testlib/src/main/resources/protobuf/buf/buf_large.proto.clean
@@ -0,0 +1,229 @@
+syntax = "proto3";
+
+package com.diffplug.gradle.spotless.buf.proto;
+
+option java_multiple_files = true;
+
+message Message {
+  string message = 1;
+}
+
+service Services {
+  rpc Echo(Message) returns (Message);
+}
+
+message Message01 {
+  string message1 = 1;
+  string message2 = 2;
+  string message3 = 3;
+  string message4 = 4;
+  string message5 = 5;
+  string message6 = 6;
+  string message7 = 7;
+  string message8 = 8;
+  string message9 = 9;
+}
+
+message Message02 {
+  string message1 = 1;
+  string message2 = 2;
+  string message3 = 3;
+  string message4 = 4;
+  string message5 = 5;
+  string message6 = 6;
+  string message7 = 7;
+  string message8 = 8;
+  string message9 = 9;
+}
+
+message Message03 {
+  string message1 = 1;
+  string message2 = 2;
+  string message3 = 3;
+  string message4 = 4;
+  string message5 = 5;
+  string message6 = 6;
+  string message7 = 7;
+  string message8 = 8;
+  string message9 = 9;
+}
+
+message Message04 {
+  string message1 = 1;
+  string message2 = 2;
+  string message3 = 3;
+  string message4 = 4;
+  string message5 = 5;
+  string message6 = 6;
+  string message7 = 7;
+  string message8 = 8;
+  string message9 = 9;
+}
+
+message Message05 {
+  string message1 = 1;
+  string message2 = 2;
+  string message3 = 3;
+  string message4 = 4;
+  string message5 = 5;
+  string message6 = 6;
+  string message7 = 7;
+  string message8 = 8;
+  string message9 = 9;
+}
+
+message Message06 {
+  string message1 = 1;
+  string message2 = 2;
+  string message3 = 3;
+  string message4 = 4;
+  string message5 = 5;
+  string message6 = 6;
+  string message7 = 7;
+  string message8 = 8;
+  string message9 = 9;
+}
+
+message Message07 {
+  string message1 = 1;
+  string message2 = 2;
+  string message3 = 3;
+  string message4 = 4;
+  string message5 = 5;
+  string message6 = 6;
+  string message7 = 7;
+  string message8 = 8;
+  string message9 = 9;
+}
+
+message Message08 {
+  string message1 = 1;
+  string message2 = 2;
+  string message3 = 3;
+  string message4 = 4;
+  string message5 = 5;
+  string message6 = 6;
+  string message7 = 7;
+  string message8 = 8;
+  string message9 = 9;
+}
+
+message Message09 {
+  string message1 = 1;
+  string message2 = 2;
+  string message3 = 3;
+  string message4 = 4;
+  string message5 = 5;
+  string message6 = 6;
+  string message7 = 7;
+  string message8 = 8;
+  string message9 = 9;
+}
+
+message Message10 {
+  string message1 = 1;
+  string message2 = 2;
+  string message3 = 3;
+  string message4 = 4;
+  string message5 = 5;
+  string message6 = 6;
+  string message7 = 7;
+  string message8 = 8;
+  string message9 = 9;
+}
+
+message Message11 {
+  string message1 = 1;
+  string message2 = 2;
+  string message3 = 3;
+  string message4 = 4;
+  string message5 = 5;
+  string message6 = 6;
+  string message7 = 7;
+  string message8 = 8;
+  string message9 = 9;
+}
+
+message Message12 {
+  string message1 = 1;
+  string message2 = 2;
+  string message3 = 3;
+  string message4 = 4;
+  string message5 = 5;
+  string message6 = 6;
+  string message7 = 7;
+  string message8 = 8;
+  string message9 = 9;
+}
+
+message Message13 {
+  string message1 = 1;
+  string message2 = 2;
+  string message3 = 3;
+  string message4 = 4;
+  string message5 = 5;
+  string message6 = 6;
+  string message7 = 7;
+  string message8 = 8;
+  string message9 = 9;
+}
+
+message Message14 {
+  string message1 = 1;
+  string message2 = 2;
+  string message3 = 3;
+  string message4 = 4;
+  string message5 = 5;
+  string message6 = 6;
+  string message7 = 7;
+  string message8 = 8;
+  string message9 = 9;
+}
+
+message Message15 {
+  string message1 = 1;
+  string message2 = 2;
+  string message3 = 3;
+  string message4 = 4;
+  string message5 = 5;
+  string message6 = 6;
+  string message7 = 7;
+  string message8 = 8;
+  string message9 = 9;
+}
+
+message Message16 {
+  string message1 = 1;
+  string message2 = 2;
+  string message3 = 3;
+  string message4 = 4;
+  string message5 = 5;
+  string message6 = 6;
+  string message7 = 7;
+  string message8 = 8;
+  string message9 = 9;
+}
+
+message Message17 {
+  string message1 = 1;
+  string message2 = 2;
+  string message3 = 3;
+  string message4 = 4;
+  string message5 = 5;
+  string message6 = 6;
+  string message7 = 7;
+  string message8 = 8;
+  string message9 = 9;
+}
+
+message Message18 {
+  string message1 = 1;
+  string message2 = 2;
+  string message3 = 3;
+  string message4 = 4;
+  string message5 = 5;
+  string message6 = 6;
+  string message7 = 7;
+  string message8 = 8;
+  string message9 = 9;
+}