Unable to delete file after using SevenZip.openArchive method in java

Question

In my endpoint I receive the content of a file as String in format base64. Unzipping works fine with SevenZip library, no problems there. But after executing this line

archive = SevenZip.openInArchive(null, new RandomAccessFileInStream(
                        new RandomAccessFile(file, "r")));

java is unable to delete file because of following exception:

java.nio.file.FileSystemException: myFile.RAR: The process cannot access the file because it is being used by another process

I have tried to use junrar library, but SevenZip works better (supports RAR5 and identifies less corupted files as junrar).

pom.xml:

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>3.1.3</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</name>
    <description>demo</description>
    <properties>
        <java.version>17</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>javax.validation</groupId>
            <artifactId>validation-api</artifactId>
            <version>2.0.1.Final</version>
        </dependency>

        <dependency>
            <groupId>net.sf.sevenzipjbinding</groupId>
            <artifactId>sevenzipjbinding</artifactId>
            <version>16.02-2.01</version>
        </dependency>
        <dependency>
            <groupId>net.sf.sevenzipjbinding</groupId>
            <artifactId>sevenzipjbinding-all-platforms</artifactId>
            <version>16.02-2.01</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

Here is the dto:

public record UploadDto(
        @NotNull
        String name,
        @NotNull
        String data) {
}

Here is the controller with the logic:

import net.sf.sevenzipjbinding.IInArchive;
import net.sf.sevenzipjbinding.SevenZip;
import net.sf.sevenzipjbinding.SevenZipException;
import net.sf.sevenzipjbinding.impl.RandomAccessFileInStream;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.bind.annotation.*;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Base64;

@RestController
public class TestController {
    private final Logger log = LoggerFactory.getLogger(TestController.class);

    @PostMapping("/upload")
    public void extractRar(@RequestBody UploadDto dto){
        byte[] decodedBytes = Base64.getDecoder().decode(dto.data());
        try {
            String filePath = dto.name();
            Files.write(Paths.get(filePath), decodedBytes);
            log.info("File saved successfully to: " + filePath);
            File file = new File(filePath);
            IInArchive archive;
            try {
                archive = SevenZip.openInArchive(null, new RandomAccessFileInStream(
                        new RandomAccessFile(file, "r")));
                log.info(String.valueOf(archive.getNumberOfItems()));
            } catch (SevenZipException | FileNotFoundException e) {
                throw new RuntimeException(e);
            }
            archive.close();

            // 1 method
            Files.delete(Path.of(filePath));

            // 2 method
            if (file.delete()) {
                log.info("file deleted successfully");
            } else {
                log.error("failed to delete the temporary file used for unzipping");
            }

        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

}

example of request body :

{
  "name": "myFile.RAR",
  "data": "UmFyIRoHAM+QcwAADQAAAAAAAABTL3QgkC8AFAAAABQAAAACTeXQiWmKL1cdMAoAIAAAAG15RmlsZS50eHQAsAA/PXJhciBkYXRhIG1vY2sgaGVyZQ0KxD17AEAHAA=="
}

I have tried 2 methods to delete the file, but none of them seems to work. Also I didn't find any method to openArchive using a byte array or InputStream. The problem would be solved if I could delete the file after extracting the content or to extract the content without saving the file locally. Any help or ideas would be appreciated! OS windows 10

Answer 1

Examples found online, close the file after closing the archive.

Something like the following (depending on your needs, you may want to try-catch the close() calls separately) :

@PostMapping("/upload")
public void extractRar(@RequestBody UploadDto dto){
    byte[] decodedBytes = Base64.getDecoder().decode(dto.data());
    try {
        String filePath = dto.name();
        Files.write(Paths.get(filePath), decodedBytes);
        log.info("File saved successfully to: " + filePath);
        File file = new File(filePath);
        IInArchive archive;
        RandomAccessFile randomAccessFile;
        try {
            
            randomAccessFile = new RandomAccessFile(file, "r");
            archive = SevenZip.openInArchive(null, new RandomAccessFileInStream(randomAccessFile));
            log.info(String.valueOf(archive.getNumberOfItems()));
        } catch (SevenZipException | FileNotFoundException e) {
            throw new RuntimeException(e);
        }
        archive.close();
        randomAccessFile.close();

        // 1 method
        Files.delete(Path.of(filePath));

        // 2 method
        if (file.delete()) {
            log.info("file deleted successfully");
        } else {
            log.error("failed to delete the temporary file used for unzipping");
        }

    } catch (IOException e) {
        throw new RuntimeException(e);
    }
}