Java Edition 13w39a

13w39a is the eighth snapshot released for Java Edition 1.7.2. It adds red sand to Mesa biomes and allows for more than one enchantments on a book.

Blocks

 * Red sand
 * Generated on the lowest surface levels of the mesa biome.
 * Behaves like normal sand.
 * Can be smelted into glass and crafted into TNT, but cannot be crafted into sandstone.

Non-mob entities

 * Minecart with command block


 * Can only be obtained using, or.
 * Activated by activator rails.
 * Run their command every so often as long as they are powered - Running a command block minecart across a single powered activator rail at full speed will run its command thrice.
 * Can be success-tested while on a detector rail with a redstone comparator next to the rail (just like how the minecart with chest and minecart with hopper can be fill-checked).

Items

 * Enchanted books
 * Can now give multiple enchantments.

World generation

 * Badlands
 * Orange terracotta generates in place of sandstone, but not in the same type of formation.

General

 * Logging
 * Now done using Log4j 2.
 * Default logging location is now in logs/latest.log, older logs are archived in logs/year-months-day-counter.log.gz with GZIP compress. The year is 4 digits, and the month and day are both 2 digits. The counter is the number of startups on the day. The counter is 1 when the first startup of the day and increasing each startup.
 * The way logs are saved can be changed, examples: HTML page, database, errors only, no logging at all.

Trivia

 * 13w39a was previously removed from the launcher for some time, but was added back in September 2018.