I am trying to zip a bunch of files from different locations into one zip folder using Zip4J. I have an ArrayList of files from different folders, and as I loop through the list calling "zip.AddFile(file, params)" the files are added fine until the folder that the files are coming from switches. And I get the following error,
net.lingala.zip4j.exception.ZipException: java.lang.NullPointerException
at net.lingala.zip4j.zip.ZipEngine.initAddFiles(ZipEngine.java:187)
at net.lingala.zip4j.zip.ZipEngine.addFiles(ZipEngine.java:85)
at net.lingala.zip4j.core.ZipFile.addFiles(ZipFile.java:292)
at net.lingala.zip4j.core.ZipFile.addFile(ZipFile.java:250)
at tasks.OutputTask.compressFiles(OutputTask.java:627)
at tasks.OutputTask.uploadHelper(OutputTask.java:550)
at tasks.OutputTask.uploadHelper(OutputTask.java:593)
at tasks.OutputTask.uploadHelper(OutputTask.java:593)
at tasks.OutputTask.uploadHelper(OutputTask.java:593)
at tasks.OutputTask.uploadHelper(OutputTask.java:593)
at tasks.OutputTask.upload(OutputTask.java:516)
at tasks.OutputTask.call(OutputTask.java:279)
at tasks.OutputTask.call(OutputTask.java:1)
at javafx.concurrent.Task$TaskCallable.call(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException
at net.lingala.zip4j.zip.ZipEngine.prepareFileOutputStream(ZipEngine.java:433)
at net.lingala.zip4j.zip.ZipEngine.removeFilesIfExists(ZipEngine.java:385)
at net.lingala.zip4j.zip.ZipEngine.initAddFiles(ZipEngine.java:109)
... 17 more
The code itself is
ZipFile zip;
try {
System.out.println("Creating zip: " + outputName);
File zipfile;
if ((zipfile = new File(outputName)).exists()) {
zipfile.delete();
}
zip = new ZipFile(new File(outputName));
ZipParameters params = new ZipParameters();
if (encrypt) {
params.setEncryptFiles(true);
params.setEncryptionMethod(Zip4jConstants.ENC_METHOD_AES);
params.setAesKeyStrength(Zip4jConstants.AES_STRENGTH_256);
params.setPassword(Property.AES_ENCRYPTION_KEY.getValue());
}
params.setCompressionMethod(Zip4jConstants.COMP_DEFLATE);
params.setCompressionLevel(Zip4jConstants.DEFLATE_LEVEL_NORMAL);
for (File file : sourceFiles) {
if (file.isFile()) {
try {
zip.addFile(file, params);
} catch (ZipException e) {
e.printStackTrace();
}
}
}
So for example, here is the list of files
files = {C:/Folder1/img1, C/Folder1/txtFile, C:/Folder1/jar, C:/Folder2/img2}
the code will execute fine until it hits the "C:/Folder2/img2" where it will return the above error. I have tried
params.setSourceExternalStream(true);
which provides a different error, saying that there is no name for the external source file. Any help would be greatly appreciated. Thanks in advance
