ban-xiu opened a new issue, #327:
URL: https://github.com/apache/maven-filtering/issues/327
### Affected version
3.x
### Bug description
# Issue Description
When Maven's maven-resources-plugin filters resource files, if the file
encoding doesn't match the configured encoding, it throws
MalformedInputException: Input length = 1. However, the exception message
doesn't clearly indicate the encoding issue.
# Root Cause
In maven-filtering's FilteringUtils.copyFile() method,
Files.newBufferedReader() reads files with the specified encoding. When file
bytes don't conform to that encoding, wrapped.read() throws
MalformedInputException without including encoding information in the error
message.
# Minimum reproduction example
project:
```
encoding-test/
├── pom.xml
└── src/
└── main/
└── resources/
└── test.txt // use gbk
```
pom:
```
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
http://maven.apache.org/xsd/maven-4.0.0.xsd";>
<modelVersion>4.0.0</modelVersion>
<groupId>com.example</groupId>
<artifactId>encoding-test</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-resources-plugin</artifactId>
<version>3.5.0</version>
<configuration>
<encoding>UTF-8</encoding>
</configuration>
</plugin>
</plugins>
<resources>
<resource>
<directory>src/main/resources</directory>
<filtering>true</filtering>
</resource>
</resources>
</build>
</project>
```
cmd:
```
mvn clean resources:resources
```
log:
```
[INFO] Scanning for projects...
[INFO]
[INFO] ---------------------< com.example:encoding-test
>----------------------
[INFO] Building encoding-test 1.0-SNAPSHOT
[INFO] from pom.xml
[INFO] --------------------------------[ jar
]---------------------------------
[INFO]
[INFO] --- clean:3.2.0:clean (default-clean) @ encoding-test ---
[INFO] Deleting D:\JavaProjects\maven-filtering-coding-test\target
[INFO]
[INFO] --- resources:3.5.0:resources (default-cli) @ encoding-test ---
[INFO] Copying 2 resources from src\main\resources to target\classes
[INFO]
------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO]
------------------------------------------------------------------------
[INFO] Total time: 2.465 s
[INFO] Finished at: 2026-03-08T16:41:01+08:00
[INFO]
------------------------------------------------------------------------
[ERROR] Failed to execute goal
org.apache.maven.plugins:maven-resources-plugin:3.5.0:resources (default-cli)
on project encoding-test: filtering D:\JavaProjects\
maven-filtering-coding-test\src\main\resources\test.txt to
D:\JavaProjects\maven-filtering-coding-test\target\classes\test.txt failed with
MalformedInputException: Input length = 1 -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e
switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please
read the following articles:
[ERROR] [Help 1]
http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException
```
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