Cant Find Java In Mac Library

8 min readNov 4, 2021

Your Photos library holds all your photos, albums, slideshows, and print projects. If your library is large, and you want to free up storage space on your Mac, turn on iCloud Photo Library and use Optimize Mac Storage, or move your library to an external drive.

Nov 06, 2012 Ok, on my mac i can not find my minecraft folder in application support. I’m not sure if this makes any difference but my library folder, instead of it being in my user folder, it’s in my macintosh HD folder, probably because my big brother had it before me, so now I’m out of ideas and i really need someone’s help please. Java/Mac FAQ: Where is JAVAHOME located on Mac OS X (macOS) systems? MacOS JDK location This has changed over time, but if you’re using Mac OS X 10.9 or newer (now macOS ), your JDK/SDK JAVAHOME location for Java 8 will be something like this.

Before you start, be sure to back up your library.

Prepare your drive

You can store your library on an external storage device, such as a USB or Thunderbolt drive formatted as APFS or Mac OS Extended (Journaled).1 Find out how to check the format of your external storage device.

To prevent data loss, Apple doesn’t recommend storing photo libraries on external storage devices like SD cards and USB flash drives, or drives that are shared on a network.

Move your Photos library to an external storage device

Quit Photos.
In the Finder, go to the external drive where you want to store your library.
In another Finder window, find your library. The default location is Users > [username] > Pictures, and it’s named Photos Library.
Drag your library to its new location on the external drive. If you see an error, select your external drive’s icon in the Finder, then choose File > Get Info. If the information under Sharing & Permissions isn’t visible, click , then make sure the ‘Ignore ownership on this volume’ checkbox is selected. If it’s not selected, click to unlock it, enter an administrator name and password, then select the checkbox.2
After the move is finished, double-click Photos Library in its new location to open it.
If you use iCloud Photo Library, designate this library as the System Photo Library.

Delete original library to save space

After you open your library from its new location and make sure that it works as expected, you can delete the library from its original location.

In a Finder window, go back to your Pictures folder (or whichever folder you copied your library from) and move Photos Library to the trash. Then choose Finder > Empty Trash to delete the library and reclaim disk space.

Open another Photos library

If you have multiple libraries, here’s how to open a different one:

Quit Photos.
Press and hold the Option key while you open Photos.
Select the library that you want to open, then click Choose Library.

Photos uses this library until you open a different one.

Learn more

If you have a permissions issue with your library, you might be able to resolve the issue by using the Photos library repair tool.

Java Library List

1. You can’t move your library to a disk that’s used for Time Machine backups.

2. If the volume isn’t formatted APFS or Mac OS Extended (Journaled), or has been used for Time Machine backups but hasn’t been erased, this checkbox will either not be present, or won’t be selectable after unlocking. Erase and reformat the drive for this option to be available.

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Class

Class Mac

javax.crypto.Mac
All Implemented Interfaces:Cloneable
This class provides the functionality of a ‘Message Authentication Code’ (MAC) algorithm.
A MAC provides a way to check the integrity of information transmitted over or stored in an unreliable medium, based on a secret key. Typically, message authentication codes are used between two parties that share a secret key in order to validate information transmitted between these parties.
A MAC mechanism that is based on cryptographic hash functions is referred to as HMAC. HMAC can be used with any cryptographic hash function, e.g., SHA256 or SHA384, in combination with a secret shared key. HMAC is specified in RFC 2104.
Every implementation of the Java platform is required to support the following standard Mac algorithms:
HmacMD5
HmacSHA1
HmacSHA256
These algorithms are described in the Mac section of the Java Cryptography Architecture Standard Algorithm Name Documentation. Consult the release documentation for your implementation to see if any other algorithms are supported.
Since:1.4
Constructor Summary
ConstructorsModifierConstructor and Descriptionprotected Mac(MacSpi macSpi, Provider provider, String algorithm)
Method Summary
MethodsModifier and TypeMethod and DescriptionObjectclone()
Returns a clone if the provider implementation is cloneable.
byte[]doFinal()byte[]doFinal(byte[] input)
Processes the given array of bytes and finishes the MAC operation.
voiddoFinal(byte[] output, int outOffset)StringgetAlgorithm()
Returns the algorithm name of this Mac object.
static MacgetInstance(String algorithm)
Returns a Mac object that implements the specified MAC algorithm.
static MacgetInstance(String algorithm, Provider provider)
Returns a Mac object that implements the specified MAC algorithm.
static MacgetInstance(String algorithm, String provider)
Returns a Mac object that implements the specified MAC algorithm.
intgetMacLength()ProvidergetProvider()
Returns the provider of this Mac object.
voidinit(Key key)voidinit(Key key, AlgorithmParameterSpec params)
Initializes this Mac object with the given key and algorithm parameters.
voidreset()voidupdate(byte input)
Processes the given byte.
voidupdate(byte[] input)voidupdate(byte[] input, int offset, int len)
Processes the first len bytes in input, starting at offset inclusive.
voidupdate(ByteBuffer input)
Processes input.remaining() bytes in the ByteBuffer input, starting at input.position().
Methods inherited from class java.lang.Object
equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
Constructor Detail
Mac
Parameters:macSpi - the delegateprovider - the provideralgorithm - the algorithm
Method Detail
getAlgorithm
Returns the algorithm name of this Mac object.
This is the same name that was specified in one of the getInstance calls that created this Mac object.
Returns:the algorithm name of this Mac object.
getInstance
Returns a Mac object that implements the specified MAC algorithm.
This method traverses the list of registered security Providers, starting with the most preferred Provider. A new Mac object encapsulating the MacSpi implementation from the first Provider that supports the specified algorithm is returned.
Note that the list of registered providers may be retrieved via the Security.getProviders() method.
Parameters:algorithm - the standard name of the requested MAC algorithm. See the Mac section in the Java Cryptography Architecture Standard Algorithm Name Documentation for information about standard algorithm names.Returns:the new Mac object.Throws:NoSuchAlgorithmException - if no Provider supports a MacSpi implementation for the specified algorithm.See Also:Provider
getInstance
Returns a Mac object that implements the specified MAC algorithm.
A new Mac object encapsulating the MacSpi implementation from the specified provider is returned. The specified provider must be registered in the security provider list.
Note that the list of registered providers may be retrieved via the Security.getProviders() method.
Parameters:algorithm - the standard name of the requested MAC algorithm. See the Mac section in the Java Cryptography Architecture Standard Algorithm Name Documentation for information about standard algorithm names.provider - the name of the provider.Returns:the new Mac object.Throws:NoSuchAlgorithmException - if a MacSpi implementation for the specified algorithm is not available from the specified provider.NoSuchProviderException - if the specified provider is not registered in the security provider list.IllegalArgumentException - if the provider is null or empty.See Also:Provider
getInstance
Returns a Mac object that implements the specified MAC algorithm.
A new Mac object encapsulating the MacSpi implementation from the specified Provider object is returned. Note that the specified Provider object does not have to be registered in the provider list.
Parameters:algorithm - the standard name of the requested MAC algorithm. See the Mac section in the Java Cryptography Architecture Standard Algorithm Name Documentation for information about standard algorithm names.provider - the provider.Returns:the new Mac object.Throws:NoSuchAlgorithmException - if a MacSpi implementation for the specified algorithm is not available from the specified Provider object.IllegalArgumentException - if the provider is null.See Also:Provider
getProvider
Returns:the provider of this Mac object.
getMacLength
Returns the length of the MAC in bytes.
Returns:the MAC length in bytes.
init
Parameters:key - the key.Throws:InvalidKeyException - if the given key is inappropriate for initializing this MAC.
init
Initializes this Mac object with the given key and algorithm parameters.
Parameters:key - the key.params - the algorithm parameters.Throws:InvalidKeyException - if the given key is inappropriate for initializing this MAC.InvalidAlgorithmParameterException - if the given algorithm parameters are inappropriate for this MAC.
update
Parameters:input - the input byte to be processed.Throws:IllegalStateException - if this Mac has not been initialized.
update
Processes the given array of bytes.
Parameters:input - the array of bytes to be processed.Throws:IllegalStateException - if this Mac has not been initialized.
update
Processes the first len bytes in input, starting at offset inclusive.
Parameters:input - the input buffer.offset - the offset in input where the input starts.len - the number of bytes to process.Throws:IllegalStateException - if this Mac has not been initialized.
update
Processes input.remaining() bytes in the ByteBuffer input, starting at input.position(). Upon return, the buffer's position will be equal to its limit; its limit will not have changed.
Parameters:input - the ByteBufferThrows:IllegalStateException - if this Mac has not been initialized.Since:1.5
doFinal
Finishes the MAC operation.
A call to this method resets this Mac object to the state it was in when previously initialized via a call to init(Key) or init(Key, AlgorithmParameterSpec). That is, the object is reset and available to generate another MAC from the same key, if desired, via new calls to update and doFinal. (In order to reuse this Mac object with a different key, it must be reinitialized via a call to init(Key) or init(Key, AlgorithmParameterSpec).
Returns:the MAC result.Throws:IllegalStateException - if this Mac has not been initialized.
doFinal
Finishes the MAC operation.
A call to this method resets this Mac object to the state it was in when previously initialized via a call to init(Key) or init(Key, AlgorithmParameterSpec). That is, the object is reset and available to generate another MAC from the same key, if desired, via new calls to update and doFinal. (In order to reuse this Mac object with a different key, it must be reinitialized via a call to init(Key) or init(Key, AlgorithmParameterSpec).
The MAC result is stored in output, starting at outOffset inclusive.
Parameters:output - the buffer where the MAC result is storedoutOffset - the offset in output where the MAC is storedThrows:ShortBufferException - if the given output buffer is too small to hold the resultIllegalStateException - if this Mac has not been initialized.
doFinal
Processes the given array of bytes and finishes the MAC operation.
A call to this method resets this Mac object to the state it was in when previously initialized via a call to init(Key) or init(Key, AlgorithmParameterSpec). That is, the object is reset and available to generate another MAC from the same key, if desired, via new calls to update and doFinal. (In order to reuse this Mac object with a different key, it must be reinitialized via a call to init(Key) or init(Key, AlgorithmParameterSpec).
Parameters:input - data in bytesReturns:the MAC result.Throws:IllegalStateException - if this Mac has not been initialized.
reset
Resets this Mac object.
A call to this method resets this Mac object to the state it was in when previously initialized via a call to init(Key) or init(Key, AlgorithmParameterSpec). That is, the object is reset and available to generate another MAC from the same key, if desired, via new calls to update and doFinal. (In order to reuse this Mac object with a different key, it must be reinitialized via a call to init(Key) or init(Key, AlgorithmParameterSpec).
clone
Returns a clone if the provider implementation is cloneable.
Overrides:clone in class ObjectReturns:a clone if the provider implementation is cloneable.Throws:CloneNotSupportedException - if this is called on a delegate that does not support Cloneable.See Also:Cloneable
Class

Mac Install Java

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