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Merge pull request #66 from murtuza-ranapur/spring-boot-exception-handling

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Adds Code example for Spring Boot exception Handling tutorial
This commit is contained in:
Tom Hombergs
2020-12-30 07:48:53 +11:00
committed by GitHub
parent e2d6cc3acb 87a6cac6b3
commit 381be70991
24 changed files with 714 additions and 0 deletions
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1
build-all.sh
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@@ -86,6 +86,7 @@ if [[ "$MODULE" == "module5" ]]
then
# ADD NEW MODULES HERE
# (add new modules above the rest so you get quicker feedback if it fails)
build_gradle_module "spring-boot/exception-handling"
build_maven_module "spring-boot/spring-boot-elasticsearch"
build_gradle_module "spring-boot/spring-boot-mocking-modules"
build_gradle_module "spring-boot/specification"

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spring-boot/exception-handling/README.md Normal file
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# Spring Exception handling tutorial
* The code examples in this project showcases various ways to handle exceptions in
a Spring Boot Application

36
spring-boot/exception-handling/build.gradle Normal file
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plugins {
id 'org.springframework.boot' version '2.4.0'
id 'io.spring.dependency-management' version '1.0.10.RELEASE'
id 'java'
}
group = 'io.reflectoring'
version = '0.0.1'
sourceCompatibility = '11'
configurations {
compileOnly {
extendsFrom annotationProcessor
}
}
repositories {
mavenCentral()
}
dependencies {
implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
implementation 'org.springframework.boot:spring-boot-starter-web'
implementation 'org.springframework.boot:spring-boot-starter-validation'
implementation 'org.apache.commons:commons-lang3'
compileOnly 'org.projectlombok:lombok'
runtimeOnly 'com.h2database:h2'
annotationProcessor 'org.projectlombok:lombok'
testImplementation('org.springframework.boot:spring-boot-starter-test') {
exclude group: 'org.junit.vintage', module: 'junit-vintage-engine'
}
}
test {
useJUnitPlatform()
}

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spring-boot/exception-handling/gradle/wrapper/gradle-wrapper.jar vendored Normal file
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spring-boot/exception-handling/gradle/wrapper/gradle-wrapper.properties vendored Normal file
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#Fri Nov 27 17:09:23 IST 2020
distributionUrl=https\://services.gradle.org/distributions/gradle-6.6.1-all.zip
distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
zipStorePath=wrapper/dists
zipStoreBase=GRADLE_USER_HOME

184
spring-boot/exception-handling/gradlew vendored Normal file
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@@ -0,0 +1,184 @@
#!/usr/bin/env sh
#
# Copyright 2015 the original author or authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
##############################################################################
##
## Gradle start up script for UN*X
##
##############################################################################
# Attempt to set APP_HOME
# Resolve links: $0 may be a link
PRG="$0"
# Need this for relative symlinks.
while [ -h "$PRG" ]; do
ls=$(ls -ld "$PRG")
link=$(expr "$ls" : '.*-> \(.*\)$')
if expr "$link" : '/.*' >/dev/null; then
PRG="$link"
else
PRG=$(dirname "$PRG")"/$link"
fi
done
SAVED="$(pwd)"
cd "$(dirname \"$PRG\")/" >/dev/null
APP_HOME="$(pwd -P)"
cd "$SAVED" >/dev/null
APP_NAME="Gradle"
APP_BASE_NAME=$(basename "$0")
# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
# Use the maximum available, or set MAX_FD != -1 to use that value.
MAX_FD="maximum"
warn() {
echo "$*"
}
die() {
echo
echo "$*"
echo
exit 1
}
# OS specific support (must be 'true' or 'false').
cygwin=false
msys=false
darwin=false
nonstop=false
case "$(uname)" in
CYGWIN*)
cygwin=true
;;
Darwin*)
darwin=true
;;
MINGW*)
msys=true
;;
NONSTOP*)
nonstop=true
;;
esac
CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
# Determine the Java command to use to start the JVM.
if [ -n "$JAVA_HOME" ]; then
if [ -x "$JAVA_HOME/jre/sh/java" ]; then
# IBM's JDK on AIX uses strange locations for the executables
JAVACMD="$JAVA_HOME/jre/sh/java"
else
JAVACMD="$JAVA_HOME/bin/java"
fi
if [ ! -x "$JAVACMD" ]; then
die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
fi
else
JAVACMD="java"
which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
fi
# Increase the maximum file descriptors if we can.
if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ]; then
MAX_FD_LIMIT=$(ulimit -H -n)
if [ $? -eq 0 ]; then
if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ]; then
MAX_FD="$MAX_FD_LIMIT"
fi
ulimit -n $MAX_FD
if [ $? -ne 0 ]; then
warn "Could not set maximum file descriptor limit: $MAX_FD"
fi
else
warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
fi
fi
# For Darwin, add options to specify how the application appears in the dock
if $darwin; then
GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
fi
# For Cygwin or MSYS, switch paths to Windows format before running java
if [ "$cygwin" = "true" -o "$msys" = "true" ]; then
APP_HOME=$(cygpath --path --mixed "$APP_HOME")
CLASSPATH=$(cygpath --path --mixed "$CLASSPATH")
JAVACMD=$(cygpath --unix "$JAVACMD")
# We build the pattern for arguments to be converted via cygpath
ROOTDIRSRAW=$(find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null)
SEP=""
for dir in $ROOTDIRSRAW; do
ROOTDIRS="$ROOTDIRS$SEP$dir"
SEP="|"
done
OURCYGPATTERN="(^($ROOTDIRS))"
# Add a user-defined pattern to the cygpath arguments
if [ "$GRADLE_CYGPATTERN" != "" ]; then
OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
fi
# Now convert the arguments - kludge to limit ourselves to /bin/sh
i=0
for arg in "$@"; do
CHECK=$(echo "$arg" | egrep -c "$OURCYGPATTERN" -)
CHECK2=$(echo "$arg" | egrep -c "^-") ### Determine if an option
if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ]; then ### Added a condition
eval $(echo args$i)=$(cygpath --path --ignore --mixed "$arg")
else
eval $(echo args$i)="\"$arg\""
fi
i=$(expr $i + 1)
done
case $i in
0) set -- ;;
1) set -- "$args0" ;;
2) set -- "$args0" "$args1" ;;
3) set -- "$args0" "$args1" "$args2" ;;
4) set -- "$args0" "$args1" "$args2" "$args3" ;;
5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
esac
fi
# Escape application args
save() {
for i; do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/"; done
echo " "
}
APP_ARGS=$(save "$@")
# Collect all arguments for the java command, following the shell quoting and substitution rules
eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
exec "$JAVACMD" "$@"

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spring-boot/exception-handling/gradlew.bat vendored Normal file
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@rem
@rem Copyright 2015 the original author or authors.
@rem
@rem Licensed under the Apache License, Version 2.0 (the "License");
@rem you may not use this file except in compliance with the License.
@rem You may obtain a copy of the License at
@rem
@rem https://www.apache.org/licenses/LICENSE-2.0
@rem
@rem Unless required by applicable law or agreed to in writing, software
@rem distributed under the License is distributed on an "AS IS" BASIS,
@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@rem See the License for the specific language governing permissions and
@rem limitations under the License.
@rem
@if "%DEBUG%" == "" @echo off
@rem ##########################################################################
@rem
@rem Gradle startup script for Windows
@rem
@rem ##########################################################################
@rem Set local scope for the variables with windows NT shell
if "%OS%"=="Windows_NT" setlocal
set DIRNAME=%~dp0
if "%DIRNAME%" == "" set DIRNAME=.
set APP_BASE_NAME=%~n0
set APP_HOME=%DIRNAME%
@rem Resolve any "." and ".." in APP_HOME to make it shorter.
for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
@rem Find java.exe
if defined JAVA_HOME goto findJavaFromJavaHome
set JAVA_EXE=java.exe
%JAVA_EXE% -version >NUL 2>&1
if "%ERRORLEVEL%" == "0" goto execute
echo.
echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
echo.
echo Please set the JAVA_HOME variable in your environment to match the
echo location of your Java installation.
goto fail
:findJavaFromJavaHome
set JAVA_HOME=%JAVA_HOME:"=%
set JAVA_EXE=%JAVA_HOME%/bin/java.exe
if exist "%JAVA_EXE%" goto execute
echo.
echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
echo.
echo Please set the JAVA_HOME variable in your environment to match the
echo location of your Java installation.
goto fail
:execute
@rem Setup the command line
set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
@rem Execute Gradle
"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
:end
@rem End local scope for the variables with windows NT shell
if "%ERRORLEVEL%"=="0" goto mainEnd
:fail
rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
rem the _cmd.exe /c_ return code!
if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
exit /b 1
:mainEnd
if "%OS%"=="Windows_NT" endlocal
:omega

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spring-boot/exception-handling/settings.gradle Normal file
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rootProject.name = 'exception'

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spring-boot/exception-handling/src/main/java/io/reflectoring/exception/ExceptionHandlingApplication.java Normal file
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package io.reflectoring.exception;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class ExceptionHandlingApplication {
public static void main(String[] args) {
SpringApplication.run(ExceptionHandlingApplication.class, args);
}
}

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spring-boot/exception-handling/src/main/java/io/reflectoring/exception/commons/I18Constants.java Normal file
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package io.reflectoring.exception.commons;
import lombok.Getter;
@Getter
public enum I18Constants {
NO_ITEM_FOUND("item.absent");
String key;
I18Constants(String key) {
this.key = key;
}
}

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spring-boot/exception-handling/src/main/java/io/reflectoring/exception/controller/ProductController.java Normal file
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@@ -0,0 +1,30 @@
package io.reflectoring.exception.controller;
import io.reflectoring.exception.entity.Product;
import io.reflectoring.exception.model.ProductInput;
import io.reflectoring.exception.service.ProductService;
import lombok.AllArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.*;
import javax.validation.Valid;
@Slf4j(topic = "PRODUCT_CONTROLLER")
@RestController
@RequestMapping("/product")
@AllArgsConstructor
public class ProductController {
private final ProductService productService;
@GetMapping("/{id}")
public Product getProduct(@PathVariable String id){
return productService.getProduct(id);
}
@PostMapping
public Product addProduct(@RequestBody @Valid ProductInput input){
return productService.addProduct(input);
}
}

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spring-boot/exception-handling/src/main/java/io/reflectoring/exception/entity/Category.java Normal file
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@@ -0,0 +1,10 @@
package io.reflectoring.exception.entity;
public enum Category {
MOBILE,
TV_APPLIANCES,
MEN_FASHION,
WOMEN_FASHION,
BOOKS,
BEAUTY
}

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spring-boot/exception-handling/src/main/java/io/reflectoring/exception/entity/Product.java Normal file
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package io.reflectoring.exception.entity;
import lombok.Getter;
import lombok.Setter;
import javax.persistence.*;
import java.time.LocalDateTime;
@Entity
@Getter
@Setter
public class Product {
@Id
private String id;
private String name;
private Double price;
private LocalDateTime manufacturingDate;
private Double weight;
@Embedded
private Dimension dimension;
@Enumerated(EnumType.STRING)
private Category category;
@Embeddable
@Getter
@Setter
public static class Dimension {
private Double height;
private Double width;
}
}

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spring-boot/exception-handling/src/main/java/io/reflectoring/exception/exception/ErrorResponse.java Normal file
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package io.reflectoring.exception.exception;
import com.fasterxml.jackson.annotation.JsonInclude;
import lombok.Getter;
import lombok.RequiredArgsConstructor;
import lombok.Setter;
import org.springframework.validation.Errors;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
@Getter
@Setter
@RequiredArgsConstructor
@JsonInclude(JsonInclude.Include.NON_NULL)
public class ErrorResponse {
private final int status;
private final String message;
private String stackTrace;
private List<ValidationError> errors;
@Getter
@Setter
@RequiredArgsConstructor
private static class ValidationError {
private final String field;
private final String message;
}
public void addValidationError(String field, String message){
if(Objects.isNull(errors)){
errors = new ArrayList<>();
}
errors.add(new ValidationError(field, message));
}
}

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spring-boot/exception-handling/src/main/java/io/reflectoring/exception/exception/GlobalExceptionHandler.java Normal file
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package io.reflectoring.exception.exception;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.exception.ExceptionUtils;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.validation.FieldError;
import org.springframework.web.bind.MethodArgumentNotValidException;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseStatus;
import org.springframework.web.bind.annotation.RestControllerAdvice;
import org.springframework.web.context.request.WebRequest;
import org.springframework.web.servlet.mvc.method.annotation.ResponseEntityExceptionHandler;
import java.util.Objects;
@Slf4j(topic = "GLOBAL_EXCEPTION_HANDLER")
@RestControllerAdvice
public class GlobalExceptionHandler extends ResponseEntityExceptionHandler {
public static final String TRACE = "trace";
@Value("${reflectoring.trace:false}")
private boolean printStackTrace;
@Override
@ResponseStatus(HttpStatus.UNPROCESSABLE_ENTITY)
protected ResponseEntity<Object> handleMethodArgumentNotValid(MethodArgumentNotValidException ex,
HttpHeaders headers,
HttpStatus status,
WebRequest request) {
ErrorResponse errorResponse = new ErrorResponse(HttpStatus.UNPROCESSABLE_ENTITY.value(), "Validation error. Check 'errors' field for details.");
for (FieldError fieldError : ex.getBindingResult().getFieldErrors()) {
errorResponse.addValidationError(fieldError.getField(), fieldError.getDefaultMessage());
}
return ResponseEntity.unprocessableEntity().body(errorResponse);
}
@ExceptionHandler(NoSuchElementFoundException.class)
@ResponseStatus(HttpStatus.NOT_FOUND)
public ResponseEntity<Object> handleNoSuchElementFoundException(NoSuchElementFoundException itemNotFoundException, WebRequest request) {
log.error("Failed to find the requested element", itemNotFoundException);
return buildErrorResponse(itemNotFoundException, HttpStatus.NOT_FOUND, request);
}
@ExceptionHandler(Exception.class)
@ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)
public ResponseEntity<Object> handleAllUncaughtException(Exception exception, WebRequest request) {
log.error("Unknown error occurred", exception);
return buildErrorResponse(exception, "Unknown error occurred", HttpStatus.INTERNAL_SERVER_ERROR, request);
}
private ResponseEntity<Object> buildErrorResponse(Exception exception,
HttpStatus httpStatus,
WebRequest request) {
return buildErrorResponse(exception, exception.getMessage(), httpStatus, request);
}
private ResponseEntity<Object> buildErrorResponse(Exception exception,
String message,
HttpStatus httpStatus,
WebRequest request) {
ErrorResponse errorResponse = new ErrorResponse(httpStatus.value(), message);
if (printStackTrace && isTraceOn(request)) {
errorResponse.setStackTrace(ExceptionUtils.getStackTrace(exception));
}
return ResponseEntity.status(httpStatus).body(errorResponse);
}
private boolean isTraceOn(WebRequest request) {
String[] value = request.getParameterValues(TRACE);
return Objects.nonNull(value)
&& value.length > 0
&& value[0].contentEquals("true");
}
@Override
public ResponseEntity<Object> handleExceptionInternal(
Exception ex,
Object body,
HttpHeaders headers,
HttpStatus status,
WebRequest request) {
return buildErrorResponse(ex, status, request);
}
}

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spring-boot/exception-handling/src/main/java/io/reflectoring/exception/exception/NoSuchElementFoundException.java Normal file
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package io.reflectoring.exception.exception;
import org.springframework.http.HttpStatus;
import org.springframework.web.server.ResponseStatusException;
public class NoSuchElementFoundException extends RuntimeException {
public NoSuchElementFoundException(String message){
super(message);
}
}

24
spring-boot/exception-handling/src/main/java/io/reflectoring/exception/model/ProductInput.java Normal file
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package io.reflectoring.exception.model;
import io.reflectoring.exception.entity.Category;
import lombok.Getter;
import lombok.Setter;
import javax.validation.constraints.NotBlank;
import javax.validation.constraints.NotEmpty;
import javax.validation.constraints.NotNull;
@Getter
@Setter
public class ProductInput {
@NotBlank
private String name;
@NotNull
private Double price;
private Double weight;
private Category category;
}

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spring-boot/exception-handling/src/main/java/io/reflectoring/exception/model/Response.java Normal file
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package io.reflectoring.exception.model;
import lombok.Getter;
import lombok.Setter;
@Getter
@Setter
public class Response {
private String message;
}

9
spring-boot/exception-handling/src/main/java/io/reflectoring/exception/repository/ProductRepository.java Normal file
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package io.reflectoring.exception.repository;
import io.reflectoring.exception.entity.Product;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;
@Repository
public interface ProductRepository extends JpaRepository<Product, String> {
}

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spring-boot/exception-handling/src/main/java/io/reflectoring/exception/service/ProductService.java Normal file
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package io.reflectoring.exception.service;
import io.reflectoring.exception.commons.I18Constants;
import io.reflectoring.exception.entity.Category;
import io.reflectoring.exception.entity.Product;
import io.reflectoring.exception.exception.NoSuchElementFoundException;
import io.reflectoring.exception.model.ProductInput;
import io.reflectoring.exception.repository.ProductRepository;
import lombok.AllArgsConstructor;
import org.springframework.context.MessageSource;
import org.springframework.stereotype.Service;
import java.util.Locale;
import java.util.Objects;
@Service
@AllArgsConstructor
public class ProductService {
private final ProductRepository repository;
private final MessageSource messageSource;
public Product getProduct(String id) {
return repository.findById(id).orElseThrow(()->
new NoSuchElementFoundException(getLocalMessage(I18Constants.NO_ITEM_FOUND.getKey(), id)));
}
public Product addProduct(ProductInput productInput){
Product product = new Product();
product.setName(productInput.getName());
product.setPrice(productInput.getPrice());
product.setWeight(product.getWeight());
product.setCategory(Objects.isNull(productInput.getCategory())? Category.BOOKS: productInput.getCategory());
return repository.save(product);
}
private String getLocalMessage(String key, String... params){
return messageSource.getMessage(key,
params,
Locale.ENGLISH);
}
}

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spring-boot/exception-handling/src/main/resources/application.yaml Normal file
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server:
error:
include-message: always
include-binding-errors: always
include-stacktrace: on_trace_param
include-exception: true
reflectoring:
trace: true
spring:
jpa:
show-sql: true
generate-ddl: true
hibernate:
ddl-auto: create-drop
messages:
basename: lang/res
mvc:
throw-exception-if-no-handler-found: true
web:
resources:
add-mappings: false

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spring-boot/exception-handling/src/main/resources/data.sql Normal file
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insert into product
(id, name, price, manufacturing_date, weight, height, width, category)
values
('prod_1', 'one plus 8T', 100, now(), 2.2, 3.4, 5.4, 'MOBILE');
insert into product
(id, name, price, manufacturing_date, weight, height, width, category)
values
('prod_2', 'Samsung 100 S', 200, now(), 5.6, 7.9, 4.3, 'MOBILE');
insert into product
(id, name, price, manufacturing_date, weight, height, width, category)
values
('prod_3', 'Armani jacket size 32', 1100, now(), 1.3, 10.4, 29.5, 'MEN_FASHION');
insert into product
(id, name, price, manufacturing_date, weight, height, width, category)
values
('prod_4', 'Zara purse', 500, now(), 3.7, 50.6, 70.6, 'WOMEN_FASHION');
insert into product
(id, name, price, manufacturing_date, weight, height, width, category)
values
('prod_5', 'Sony Bravia ', 2000, now(), 25.5, 48.8, 25.9, 'TV_APPLIANCES');
insert into product
(id, name, price, manufacturing_date, weight, height, width, category)
values
('prod_6', 'zara jacket green color', 1500, now(), 1.3, 10.4, 29.5, 'MEN_FASHION');

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spring-boot/exception-handling/src/main/resources/lang/res.properties Normal file
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item.absent=Item with id {0} not found

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spring-boot/exception-handling/src/test/java/io/reflectoring/exception/ExceptionHandlingApplicationTests.java Normal file
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package io.reflectoring.exception;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;
@SpringBootTest
class ExceptionHandlingApplicationTests {
@Test
void contextLoads() {
}
}