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Building a RAG System with LangChain4J and Redis Agent Memory Server

The Genesis: Why Alexa Needed a Memory Upgrade

It started with a simple frustration. Every conversation with Alexa felt like talking to someone with amnesia. "Alexa, remember my daughter's birthday is March 15th." Five minutes later: "Alexa, when is my daughter's birthday?" Silence. Or worse, "I don't have that information."

In 2024, with all our advances in AI, this felt fundamentally broken. So I decided to fix it.

What began as a weekend project to give Alexa memory capabilities evolved into a full-scale implementation of a production-ready RAG system. This is the story of how I built "My Jarvis" - an Alexa skill that not only remembers but understands context, manages knowledge bases, and even suggests reminders.

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import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.*;

/**
 * This file is deliberately coded to avoid all dependencies outside
 * of the JDK, e.g. JUnit, for the sake of simplicity of use.
 */

class BackendCodeExercise {

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Building the main VirtualBox module.
Error building the module:
make V=1 CONFIG_MODULE_SIG= CONFIG_MODULE_SIG_ALL= -C /lib/modules/5.8.4-200.fc32.x86_64/build M=/tmp/vbox.0 SRCROOT=/tmp/vbox.0 -j12 modules
make[1]: warning: -jN forced in submake: disabling jobserver mode.
make -f ./scripts/Makefile.build obj=/tmp/vbox.0 \
single-build= \
need-builtin=1 need-modorder=1
  gcc -Wp,-MMD,/tmp/vbox.0/linux/.SUPDrv-linux.o.d  -nostdinc -isystem /usr/lib/gcc/x86_64-redhat-linux/10/include -I./arch/x86/include -I./arch/x86/include/generated  -I./include -I./arch/x86/include/uapi -I./arch/x86/include/generated/uapi -I./include/uapi -I./include/generated/uapi -include ./include/linux/kconfig.h -include ./include/linux/compiler_types.h -D__KERNEL__ -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE -Werror=implicit-function-declaration -Werror=implicit-int -Wno-format-security -Wno-address-of-packed-member -std=gnu89 -mno-sse -mno-mmx -mno-sse2 -mno-3dnow -mno-a

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SELECT COUNT(dateTime) AS totalCountTPS
FROM paymentTransactionsChannel [RANGE 1 SECOND SLIDE 1 SECOND]
WHERE ammount > 0 AND brand IS NOT NULL

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        IDENTIFICATION DIVISION.
        PROGRAM-ID. CSIMPSRV.
        AUTHOR. TUXEDO DEVELOPMENT.
        ENVIRONMENT DIVISION.
        CONFIGURATION SECTION.
        DATA DIVISION.
        WORKING-STORAGE SECTION.

        01  TPSVCRET-REC.
        COPY TPSVCRET.

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*RESOURCES
IPCKEY		123456

DOMAINID	UBBCSIMPLE
MASTER		simple
MAXACCESSERS	5
MAXSERVERS	5
MAXSERVICES	10
MODEL		SHM
LDBAL		N

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. 'helloworld'.
       ENVIRONMENT DIVISION.
       INPUT-OUTPUT SECTION.
       FILE-CONTROL.
       DATA DIVISION.
       FILE SECTION.

       WORKING-STORAGE SECTION.

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. 'helloworld'.
       ENVIRONMENT DIVISION.
       INPUT-OUTPUT SECTION.
       FILE-CONTROL.
       DATA DIVISION.
       FILE SECTION.

       WORKING-STORAGE SECTION.

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Set 07, 2011 1:07:30 PM com.sun.enterprise.admin.launcher.GFLauncherLogger info
INFO: JVM invocation command line:
C:\jdk1.7.0\bin\java.exe
-cp
C:/glassfish3/glassfish/modules/glassfish.jar
-XX:+UnlockDiagnosticVMOptions
-XX:MaxPermSize=192m
-XX:NewRatio=2
-Xmx512m
-client

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<?xml version='1.0'?>

<!--
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Oracle is a registered trademarks of Oracle Corporation and/or its affiliates.

This software is the confidential and proprietary information of
Oracle Corporation. You shall not disclose such confidential and
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