Managing data inside and between Docker containers

Data written to the file system does not persist across Docker container lifecycles. You can manage data in Docker containers using data volumes and data volume containers.

This rule flags Java code that references the following classes, constructors, and methods that are used for writing files.

Classes

• java.io.FileOutputStream
• java.io.FileWriter

Constructors

• new java.io.PrintWriter(java.io.File)
• new java.io.PrintWriter(java.io.File, java.lang.String)
• new java.io.PrintWriter(java.lang.String)
• new java.io.PrintWriter(java.lang.String, java.lang.String)

Methods

java.io.RandomAccessFile

• write
• writeBoolean
• writeByte
• writeBytes
• writeChar
• writeChars
• writeDouble
• writeFloat
• writeInt
• writeLong
• writeShort
• writeUTF
• setLength

java.nio.file.Files:

• copy
• createDirectories
• createFile
• move
• newBufferedWriter
• newByteChannel
• write

org.apache.commons.io.FileUtils

• copyDirectory
• copyDirectoryToDirectory
• copyFile
• copyFileToDirectory
• copyInputStreamToFile
• copyToFile
• copyURLToFile
• moveDirectory
• moveDirectoryToDirectory
• moveFile
• moveFileToDirectory
• moveToDirectory
• write
• writeByteArrayToFile
• writeLines
• writeStringToFile

For more information, see Manage data in Docker.