Forge INSTALLER ran out of memory?

[PulsarNyx]

Quote

JVM info: Oracle Corporation - 1.8.0_251 - 25.251-b08
java.net.preferIPv4Stack=true
Found java version 1.8.0_251
Extracting json
Considering minecraft client jar
Downloading libraries
Considering library net.minecraftforge:forge:1.15.2-31.2.0
  File exists: Checksum validated.
Considering library org.ow2.asm:asm:7.2
  File exists: Checksum validated.
Considering library org.ow2.asm:asm-commons:7.2
  File exists: Checksum validated.
Considering library org.ow2.asm:asm-tree:7.2
  File exists: Checksum validated.
Considering library cpw.mods:modlauncher:5.1.0
  File exists: Checksum validated.
Considering library cpw.mods:grossjava9hacks:1.3.0
  File exists: Checksum validated.
Considering library net.minecraftforge:accesstransformers:2.1.1-shadowed
  File exists: Checksum validated.
Considering library net.minecraftforge:eventbus:2.2.0-service
  File exists: Checksum validated.
Considering library net.minecraftforge:forgespi:2.1.2
  File exists: Checksum validated.
Considering library net.minecraftforge:coremods:2.0.3
  File exists: Checksum validated.
Considering library net.minecraftforge:unsafe:0.2.0
  File exists: Checksum validated.
Considering library com.electronwill.night-config:core:3.6.2
  File exists: Checksum validated.
Considering library com.electronwill.night-config:toml:3.6.2
  File exists: Checksum validated.
Considering library org.jline:jline:3.12.1
  File exists: Checksum validated.
Considering library org.apache.maven:maven-artifact:3.6.0
  File exists: Checksum validated.
Considering library net.jodah:typetools:0.8.1
  File exists: Checksum validated.
Considering library org.apache.logging.log4j:log4j-api:2.11.2
  File exists: Checksum validated.
Considering library org.apache.logging.log4j:log4j-core:2.11.2
  File exists: Checksum validated.
Considering library net.minecrell:terminalconsoleappender:1.2.0
  File exists: Checksum validated.
Considering library net.sf.jopt-simple:jopt-simple:5.0.4
  File exists: Checksum validated.
Considering library com.github.jponge:lzma-java:1.3
  File exists: Checksum validated.
Considering library com.google.code.findbugs:jsr305:3.0.2
  File exists: Checksum validated.
Considering library com.google.code.gson:gson:2.8.0
  File exists: Checksum validated.
Considering library com.google.errorprone:error_prone_annotations:2.1.3
  File exists: Checksum validated.
Considering library com.google.guava:guava:20.0
  File exists: Checksum validated.
Considering library com.google.guava:guava:25.1-jre
  File exists: Checksum validated.
Considering library com.google.j2objc:j2objc-annotations:1.1
  File exists: Checksum validated.
Considering library com.nothome:javaxdelta:2.0.1
  File exists: Checksum validated.
Considering library commons-io:commons-io:2.4
  File exists: Checksum validated.
Considering library de.oceanlabs.mcp:mcp_config:1.15.2-20200515.085601@zip
  File exists: Checksum validated.
Considering library net.md-5:SpecialSource:1.8.5
  File exists: Checksum validated.
Considering library net.minecraftforge:binarypatcher:1.0.12
  File exists: Checksum validated.
Considering library net.minecraftforge:forge:1.15.2-31.2.0:universal
  File exists: Checksum validated.
Considering library net.minecraftforge:installertools:1.1.4
  File exists: Checksum validated.
Considering library net.minecraftforge:jarsplitter:1.1.2
  File exists: Checksum validated.
Considering library net.sf.jopt-simple:jopt-simple:4.9
  File exists: Checksum validated.
Considering library net.sf.jopt-simple:jopt-simple:5.0.4
  File exists: Checksum validated.
Considering library net.sf.opencsv:opencsv:2.3
  File exists: Checksum validated.
Considering library org.checkerframework:checker-qual:2.0.0
  File exists: Checksum validated.
Considering library org.codehaus.mojo:animal-sniffer-annotations:1.14
  File exists: Checksum validated.
Considering library org.ow2.asm:asm-analysis:6.1.1
  File exists: Checksum validated.
Considering library org.ow2.asm:asm-commons:6.1.1
  File exists: Checksum validated.
Considering library org.ow2.asm:asm-tree:6.1.1
  File exists: Checksum validated.
Considering library org.ow2.asm:asm:6.1.1
  File exists: Checksum validated.
Considering library trove:trove:1.0.2
  File exists: Checksum validated.
Created Temporary Directory: C:\Users\User\AppData\Local\Temp\forge_installer1570900954757147810
  Extracting: /data/client.lzma
Building Processors
===============================================================================
  MainClass: net.minecraftforge.installertools.ConsoleTool
  Classpath:
    C:\Users\User\AppData\Roaming\.minecraft\libraries\net\minecraftforge\installertools\1.1.4\installertools-1.1.4.jar
    C:\Users\User\AppData\Roaming\.minecraft\libraries\net\md-5\SpecialSource\1.8.5\SpecialSource-1.8.5.jar
    C:\Users\User\AppData\Roaming\.minecraft\libraries\net\sf\jopt-simple\jopt-simple\5.0.4\jopt-simple-5.0.4.jar
    C:\Users\User\AppData\Roaming\.minecraft\libraries\com\google\code\gson\gson\2.8.0\gson-2.8.0.jar
    C:\Users\User\AppData\Roaming\.minecraft\libraries\org\ow2\asm\asm-commons\6.1.1\asm-commons-6.1.1.jar
    C:\Users\User\AppData\Roaming\.minecraft\libraries\com\google\guava\guava\20.0\guava-20.0.jar
    C:\Users\User\AppData\Roaming\.minecraft\libraries\net\sf\opencsv\opencsv\2.3\opencsv-2.3.jar
    C:\Users\User\AppData\Roaming\.minecraft\libraries\org\ow2\asm\asm-analysis\6.1.1\asm-analysis-6.1.1.jar
    C:\Users\User\AppData\Roaming\.minecraft\libraries\org\ow2\asm\asm-tree\6.1.1\asm-tree-6.1.1.jar
    C:\Users\User\AppData\Roaming\.minecraft\libraries\org\ow2\asm\asm\6.1.1\asm-6.1.1.jar
  Args: --task, MCP_DATA, --input, C:\Users\User\AppData\Roaming\.minecraft\libraries\de\oceanlabs\mcp\mcp_config\1.15.2-20200515.085601\mcp_config-1.15.2-20200515.085601.zip, --output, C:\Users\User\AppData\Roaming\.minecraft\libraries\de\oceanlabs\mcp\mcp_config\1.15.2-20200515.085601\mcp_config-1.15.2-20200515.085601-mappings.txt, --key, mappings
Task: MCP_DATA
Input:  C:\Users\User\AppData\Roaming\.minecraft\libraries\de\oceanlabs\mcp\mcp_config\1.15.2-20200515.085601\mcp_config-1.15.2-20200515.085601.zip
Output: C:\Users\User\AppData\Roaming\.minecraft\libraries\de\oceanlabs\mcp\mcp_config\1.15.2-20200515.085601\mcp_config-1.15.2-20200515.085601-mappings.txt
Key:    mappings
Extracting: config/joined.tsrg
===============================================================================
  Cache: 
Exception in thread "main" 
java.lang.OutOfMemoryError: Java heap space
    at java.nio.file.Files.read(Unknown Source)
    at java.nio.file.Files.readAllBytes(Unknown Source)
    at net.minecraftforge.installer.DownloadUtils.getSha1(DownloadUtils.java:172)
    at net.minecraftforge.installer.actions.PostProcessors.process(PostProcessors.java:149)
    at net.minecraftforge.installer.actions.ClientInstall.run(ClientInstall.java:142)
    at net.minecraftforge.installer.InstallerPanel.run(InstallerPanel.java:428)
    at net.minecraftforge.installer.SimpleInstaller.launchGui(SimpleInstaller.java:170)
    at net.minecraftforge.installer.SimpleInstaller.main(SimpleInstaller.java:143)

This is the installer.jar file that shows up when I try to run the installer for Forge 1.15.2-31.2.0, and similar to the one for 1.15.2-31.2.31 when I try to run that. I honestly didn't even know the Forge Installer could run out of heap space, but here it is. 
 

Edited September 1, 2020 by PulsarNyx

[Ugdhar]

Make sure you are using a 64 bit Java

if running java -version from the commandline does not explicitly state 64 bit, then you have a 32 bit JVM.