From 891e044e4ae63524456165a52efc7db5c2407cd5 Mon Sep 17 00:00:00 2001 From: Ulisses Lima Date: Sun, 10 Apr 2022 17:39:01 -0300 Subject: [PATCH] BAEL-5157 - Exception Handling with Jersey First draft: https://drafts.baeldung.com/wp-admin/post.php?post=131880&action=edit --- .../ExceptionHandlingConfig.java | 19 ++++ .../jersey/exceptionhandling/data/Stock.java | 33 +++++++ .../jersey/exceptionhandling/data/Wallet.java | 51 ++++++++++ .../jersey/exceptionhandling/repo/Db.java | 32 ++++++ .../exceptionhandling/repo/Identifiable.java | 17 ++++ .../rest/StocksResource.java | 42 ++++++++ .../rest/WalletsResource.java | 98 ++++++++++++++++++ .../IllegalArgumentExceptionMapper.java | 23 +++++ .../exceptions/InvalidTradeException.java | 17 ++++ .../rest/exceptions/RestErrorResponse.java | 34 +++++++ .../exceptions/ServerExceptionMapper.java | 35 +++++++ .../exceptionhandling/service/Repository.java | 10 ++ .../rest/StocksResourceIntegrationTest.java | 99 +++++++++++++++++++ 13 files changed, 510 insertions(+) create mode 100644 jersey/src/main/java/com/baeldung/jersey/exceptionhandling/ExceptionHandlingConfig.java create mode 100644 jersey/src/main/java/com/baeldung/jersey/exceptionhandling/data/Stock.java create mode 100644 jersey/src/main/java/com/baeldung/jersey/exceptionhandling/data/Wallet.java create mode 100644 jersey/src/main/java/com/baeldung/jersey/exceptionhandling/repo/Db.java create mode 100644 jersey/src/main/java/com/baeldung/jersey/exceptionhandling/repo/Identifiable.java create mode 100644 jersey/src/main/java/com/baeldung/jersey/exceptionhandling/rest/StocksResource.java create mode 100644 jersey/src/main/java/com/baeldung/jersey/exceptionhandling/rest/WalletsResource.java create mode 100644 jersey/src/main/java/com/baeldung/jersey/exceptionhandling/rest/exceptions/IllegalArgumentExceptionMapper.java create mode 100644 jersey/src/main/java/com/baeldung/jersey/exceptionhandling/rest/exceptions/InvalidTradeException.java create mode 100644 jersey/src/main/java/com/baeldung/jersey/exceptionhandling/rest/exceptions/RestErrorResponse.java create mode 100644 jersey/src/main/java/com/baeldung/jersey/exceptionhandling/rest/exceptions/ServerExceptionMapper.java create mode 100644 jersey/src/main/java/com/baeldung/jersey/exceptionhandling/service/Repository.java create mode 100644 jersey/src/test/java/com/baeldung/jersey/exceptionhandling/rest/StocksResourceIntegrationTest.java diff --git a/jersey/src/main/java/com/baeldung/jersey/exceptionhandling/ExceptionHandlingConfig.java b/jersey/src/main/java/com/baeldung/jersey/exceptionhandling/ExceptionHandlingConfig.java new file mode 100644 index 0000000000..d4cc1a81a1 --- /dev/null +++ b/jersey/src/main/java/com/baeldung/jersey/exceptionhandling/ExceptionHandlingConfig.java @@ -0,0 +1,19 @@ +package com.baeldung.jersey.exceptionhandling; + +import javax.ws.rs.ApplicationPath; + +import org.glassfish.jersey.server.ResourceConfig; + +import com.baeldung.jersey.exceptionhandling.rest.exceptions.IllegalArgumentExceptionMapper; +import com.baeldung.jersey.exceptionhandling.rest.exceptions.ServerExceptionMapper; + +@ApplicationPath("/exception-handling/*") +public class ExceptionHandlingConfig extends ResourceConfig { + + public ExceptionHandlingConfig() { + packages("com.baeldung.jersey.exceptionhandling.rest"); + register(IllegalArgumentExceptionMapper.class); + register(ServerExceptionMapper.class); + } + +} diff --git a/jersey/src/main/java/com/baeldung/jersey/exceptionhandling/data/Stock.java b/jersey/src/main/java/com/baeldung/jersey/exceptionhandling/data/Stock.java new file mode 100644 index 0000000000..9a3f321651 --- /dev/null +++ b/jersey/src/main/java/com/baeldung/jersey/exceptionhandling/data/Stock.java @@ -0,0 +1,33 @@ +package com.baeldung.jersey.exceptionhandling.data; + +import com.baeldung.jersey.exceptionhandling.repo.Identifiable; + +public class Stock implements Identifiable { + private static final long serialVersionUID = 1L; + private String id; + private Double price; + + public Stock() { + } + + public Stock(String id, Double price) { + this.id = id; + this.price = price; + } + + public String getId() { + return id; + } + + public void setId(String id) { + this.id = id; + } + + public Double getPrice() { + return price; + } + + public void setPrice(Double price) { + this.price = price; + } +} diff --git a/jersey/src/main/java/com/baeldung/jersey/exceptionhandling/data/Wallet.java b/jersey/src/main/java/com/baeldung/jersey/exceptionhandling/data/Wallet.java new file mode 100644 index 0000000000..8ef47b4c99 --- /dev/null +++ b/jersey/src/main/java/com/baeldung/jersey/exceptionhandling/data/Wallet.java @@ -0,0 +1,51 @@ +package com.baeldung.jersey.exceptionhandling.data; + +import com.baeldung.jersey.exceptionhandling.repo.Identifiable; + +public class Wallet implements Identifiable { + private static final long serialVersionUID = 1L; + + public static final Double MIN_CHARGE = 50.0; + public static final String MIN_CHARGE_MSG = "minimum charge is: " + MIN_CHARGE; + + private String id; + private Double balance = 0.0; + + public Wallet() { + } + + public Wallet(String id) { + this.id = id; + } + + public String getId() { + return id; + } + + public void setId(String id) { + this.id = id; + } + + public Double getBalance() { + return balance; + } + + public void setBalance(Double balance) { + this.balance = balance; + } + + public Double addBalance(Double amount) { + if (balance == null) + balance = 0.0; + + return balance += amount; + } + + public boolean hasFunds(Double amount) { + if (balance == null || amount == null) { + return false; + } + + return (balance - amount) >= 0; + } +} diff --git a/jersey/src/main/java/com/baeldung/jersey/exceptionhandling/repo/Db.java b/jersey/src/main/java/com/baeldung/jersey/exceptionhandling/repo/Db.java new file mode 100644 index 0000000000..c91085f25b --- /dev/null +++ b/jersey/src/main/java/com/baeldung/jersey/exceptionhandling/repo/Db.java @@ -0,0 +1,32 @@ +package com.baeldung.jersey.exceptionhandling.repo; + +import java.util.HashMap; +import java.util.Map; +import java.util.Optional; +import java.util.UUID; + +public class Db { + private Map db = new HashMap<>(); + + public Optional findById(String id) { + return Optional.ofNullable(db.get(id)); + } + + public String save(T t) { + String id = t.getId(); + if (id == null) { + id = UUID.randomUUID() + .toString(); + t.setId(id); + } + db.put(id, t); + return id; + } + + public void remove(T t) { + db.entrySet() + .removeIf(entry -> entry.getValue() + .getId() + .equals(t.getId())); + } +} diff --git a/jersey/src/main/java/com/baeldung/jersey/exceptionhandling/repo/Identifiable.java b/jersey/src/main/java/com/baeldung/jersey/exceptionhandling/repo/Identifiable.java new file mode 100644 index 0000000000..11af44bcc5 --- /dev/null +++ b/jersey/src/main/java/com/baeldung/jersey/exceptionhandling/repo/Identifiable.java @@ -0,0 +1,17 @@ +package com.baeldung.jersey.exceptionhandling.repo; + +import java.io.Serializable; + +public interface Identifiable extends Serializable { + void setId(String id); + + String getId(); + + public static void assertValid(Identifiable i) { + if (i == null) + throw new IllegalArgumentException("object cannot be null"); + + if (i.getId() == null) + throw new IllegalArgumentException("object id cannot be null"); + } +} diff --git a/jersey/src/main/java/com/baeldung/jersey/exceptionhandling/rest/StocksResource.java b/jersey/src/main/java/com/baeldung/jersey/exceptionhandling/rest/StocksResource.java new file mode 100644 index 0000000000..94ce329ad0 --- /dev/null +++ b/jersey/src/main/java/com/baeldung/jersey/exceptionhandling/rest/StocksResource.java @@ -0,0 +1,42 @@ +package com.baeldung.jersey.exceptionhandling.rest; + +import java.util.Optional; + +import javax.ws.rs.Consumes; +import javax.ws.rs.GET; +import javax.ws.rs.POST; +import javax.ws.rs.Path; +import javax.ws.rs.PathParam; +import javax.ws.rs.Produces; +import javax.ws.rs.core.MediaType; +import javax.ws.rs.core.Response; + +import com.baeldung.jersey.exceptionhandling.data.Stock; +import com.baeldung.jersey.exceptionhandling.repo.Db; +import com.baeldung.jersey.exceptionhandling.service.Repository; + +@Path("/stocks") +public class StocksResource { + private static final Db stocks = Repository.STOCKS_DB; + + @POST + @Consumes(MediaType.APPLICATION_JSON) + @Produces(MediaType.APPLICATION_JSON) + public Response post(Stock stock) { + stocks.save(stock); + + return Response.ok(stock) + .build(); + } + + @GET + @Path("/{ticker}") + @Produces(MediaType.APPLICATION_JSON) + public Response get(@PathParam("ticker") String id) { + Optional stock = stocks.findById(id); + stock.orElseThrow(IllegalArgumentException::new); + + return Response.ok(stock.get()) + .build(); + } +} diff --git a/jersey/src/main/java/com/baeldung/jersey/exceptionhandling/rest/WalletsResource.java b/jersey/src/main/java/com/baeldung/jersey/exceptionhandling/rest/WalletsResource.java new file mode 100644 index 0000000000..e5f8ddec06 --- /dev/null +++ b/jersey/src/main/java/com/baeldung/jersey/exceptionhandling/rest/WalletsResource.java @@ -0,0 +1,98 @@ +package com.baeldung.jersey.exceptionhandling.rest; + +import java.util.Optional; + +import javax.ws.rs.Consumes; +import javax.ws.rs.GET; +import javax.ws.rs.POST; +import javax.ws.rs.PUT; +import javax.ws.rs.Path; +import javax.ws.rs.PathParam; +import javax.ws.rs.Produces; +import javax.ws.rs.WebApplicationException; +import javax.ws.rs.core.MediaType; +import javax.ws.rs.core.Response; +import javax.ws.rs.core.Response.Status; + +import com.baeldung.jersey.exceptionhandling.data.Stock; +import com.baeldung.jersey.exceptionhandling.data.Wallet; +import com.baeldung.jersey.exceptionhandling.repo.Db; +import com.baeldung.jersey.exceptionhandling.rest.exceptions.InvalidTradeException; +import com.baeldung.jersey.exceptionhandling.rest.exceptions.RestErrorResponse; +import com.baeldung.jersey.exceptionhandling.service.Repository; + +@Path("/wallets") +public class WalletsResource { + private static final Db stocks = Repository.STOCKS_DB; + private static final Db wallets = Repository.WALLETS_DB; + + @POST + @Consumes(MediaType.APPLICATION_JSON) + @Produces(MediaType.APPLICATION_JSON) + public Response post(Wallet wallet) { + wallets.save(wallet); + + return Response.ok(wallet) + .build(); + } + + @GET + @Path("/{id}") + @Produces(MediaType.APPLICATION_JSON) + public Response get(@PathParam("id") String id) { + Optional wallet = wallets.findById(id); + wallet.orElseThrow(IllegalArgumentException::new); + + return Response.ok(wallet.get()) + .build(); + } + + @PUT + @Path("/{id}/{amount}") + @Produces(MediaType.APPLICATION_JSON) + public Response putAmount(@PathParam("id") String id, @PathParam("amount") Double amount) { + Optional wallet = wallets.findById(id); + wallet.orElseThrow(IllegalArgumentException::new); + + if (amount < Wallet.MIN_CHARGE) { + throw new InvalidTradeException(Wallet.MIN_CHARGE_MSG); + } + + wallet.get() + .addBalance(amount); + wallets.save(wallet.get()); + + return Response.ok(wallet) + .build(); + } + + @POST + @Path("/{wallet}/buy/{ticker}") + @Produces(MediaType.APPLICATION_JSON) + public Response postBuyStock(@PathParam("wallet") String walletId, @PathParam("ticker") String id) { + Optional stock = stocks.findById(id); + stock.orElseThrow(InvalidTradeException::new); + + Optional w = wallets.findById(walletId); + w.orElseThrow(InvalidTradeException::new); + + Wallet wallet = w.get(); + Double price = stock.get() + .getPrice(); + + if (!wallet.hasFunds(price)) { + RestErrorResponse response = new RestErrorResponse(); + response.setSubject(wallet); + response.setMessage("insufficient balance"); + throw new WebApplicationException(Response.status(Status.NOT_ACCEPTABLE) + .entity(response) + .build()); + } + + wallet.addBalance(-price); + wallets.save(wallet); + + return Response.ok(wallet) + .build(); + } +} diff --git a/jersey/src/main/java/com/baeldung/jersey/exceptionhandling/rest/exceptions/IllegalArgumentExceptionMapper.java b/jersey/src/main/java/com/baeldung/jersey/exceptionhandling/rest/exceptions/IllegalArgumentExceptionMapper.java new file mode 100644 index 0000000000..b577121027 --- /dev/null +++ b/jersey/src/main/java/com/baeldung/jersey/exceptionhandling/rest/exceptions/IllegalArgumentExceptionMapper.java @@ -0,0 +1,23 @@ +package com.baeldung.jersey.exceptionhandling.rest.exceptions; + +import javax.ws.rs.core.MediaType; +import javax.ws.rs.core.Response; +import javax.ws.rs.ext.ExceptionMapper; + +public class IllegalArgumentExceptionMapper implements ExceptionMapper { + public static final String DEFAULT_MESSAGE = "an illegal argument was provided"; + + @Override + public Response toResponse(final IllegalArgumentException exception) { + return Response.status(Response.Status.EXPECTATION_FAILED) + .entity(build(exception.getMessage())) + .type(MediaType.APPLICATION_JSON) + .build(); + } + + private RestErrorResponse build(String message) { + RestErrorResponse response = new RestErrorResponse(); + response.setMessage(DEFAULT_MESSAGE + ": " + message); + return response; + } +} diff --git a/jersey/src/main/java/com/baeldung/jersey/exceptionhandling/rest/exceptions/InvalidTradeException.java b/jersey/src/main/java/com/baeldung/jersey/exceptionhandling/rest/exceptions/InvalidTradeException.java new file mode 100644 index 0000000000..11277c048a --- /dev/null +++ b/jersey/src/main/java/com/baeldung/jersey/exceptionhandling/rest/exceptions/InvalidTradeException.java @@ -0,0 +1,17 @@ +package com.baeldung.jersey.exceptionhandling.rest.exceptions; + +import javax.ws.rs.WebApplicationException; +import javax.ws.rs.core.Response; + +public class InvalidTradeException extends WebApplicationException { + private static final long serialVersionUID = 1L; + private static final String MESSAGE = "invalid trade operation"; + + public InvalidTradeException() { + super(MESSAGE, Response.Status.NOT_ACCEPTABLE); + } + + public InvalidTradeException(String detail) { + super(MESSAGE + ": " + detail, Response.Status.NOT_ACCEPTABLE); + } +} diff --git a/jersey/src/main/java/com/baeldung/jersey/exceptionhandling/rest/exceptions/RestErrorResponse.java b/jersey/src/main/java/com/baeldung/jersey/exceptionhandling/rest/exceptions/RestErrorResponse.java new file mode 100644 index 0000000000..dd193ab059 --- /dev/null +++ b/jersey/src/main/java/com/baeldung/jersey/exceptionhandling/rest/exceptions/RestErrorResponse.java @@ -0,0 +1,34 @@ +package com.baeldung.jersey.exceptionhandling.rest.exceptions; + +public class RestErrorResponse { + private Object subject; + private String message; + + public RestErrorResponse() { + } + + public RestErrorResponse(String message) { + this.message = message; + } + + public RestErrorResponse(Object subject, String message) { + this.subject = subject; + this.message = message; + } + + public Object getSubject() { + return subject; + } + + public void setSubject(Object subject) { + this.subject = subject; + } + + public String getMessage() { + return message; + } + + public void setMessage(String message) { + this.message = message; + } +} diff --git a/jersey/src/main/java/com/baeldung/jersey/exceptionhandling/rest/exceptions/ServerExceptionMapper.java b/jersey/src/main/java/com/baeldung/jersey/exceptionhandling/rest/exceptions/ServerExceptionMapper.java new file mode 100644 index 0000000000..a6e9cc7f39 --- /dev/null +++ b/jersey/src/main/java/com/baeldung/jersey/exceptionhandling/rest/exceptions/ServerExceptionMapper.java @@ -0,0 +1,35 @@ +package com.baeldung.jersey.exceptionhandling.rest.exceptions; + +import javax.ws.rs.WebApplicationException; +import javax.ws.rs.core.MediaType; +import javax.ws.rs.core.Response; +import javax.ws.rs.core.Response.Status; +import javax.ws.rs.ext.ExceptionMapper; + +public class ServerExceptionMapper implements ExceptionMapper { + public static final String HTTP_405_MESSAGE = "METHOD_NOT_ALLOWED"; + + @Override + public Response toResponse(final WebApplicationException exception) { + String message = exception.getMessage(); + Response response = exception.getResponse(); + Status status = response.getStatusInfo() + .toEnum(); + + switch (status) { + case METHOD_NOT_ALLOWED: + message = HTTP_405_MESSAGE; + break; + case INTERNAL_SERVER_ERROR: + message = "internal validation - " + exception; + break; + default: + message = "[unhandled response code] " + exception; + } + + return Response.status(status) + .entity(status + ": " + message) + .type(MediaType.TEXT_PLAIN) + .build(); + } +} diff --git a/jersey/src/main/java/com/baeldung/jersey/exceptionhandling/service/Repository.java b/jersey/src/main/java/com/baeldung/jersey/exceptionhandling/service/Repository.java new file mode 100644 index 0000000000..459b062068 --- /dev/null +++ b/jersey/src/main/java/com/baeldung/jersey/exceptionhandling/service/Repository.java @@ -0,0 +1,10 @@ +package com.baeldung.jersey.exceptionhandling.service; + +import com.baeldung.jersey.exceptionhandling.data.Stock; +import com.baeldung.jersey.exceptionhandling.data.Wallet; +import com.baeldung.jersey.exceptionhandling.repo.Db; + +public class Repository { + public static Db STOCKS_DB = new Db<>(); + public static Db WALLETS_DB = new Db<>(); +} diff --git a/jersey/src/test/java/com/baeldung/jersey/exceptionhandling/rest/StocksResourceIntegrationTest.java b/jersey/src/test/java/com/baeldung/jersey/exceptionhandling/rest/StocksResourceIntegrationTest.java new file mode 100644 index 0000000000..1648116918 --- /dev/null +++ b/jersey/src/test/java/com/baeldung/jersey/exceptionhandling/rest/StocksResourceIntegrationTest.java @@ -0,0 +1,99 @@ +package com.baeldung.jersey.exceptionhandling.rest; + +import static org.hamcrest.CoreMatchers.containsString; +import static org.hamcrest.CoreMatchers.startsWith; +import static org.junit.Assert.assertEquals; +import static org.junit.Assert.assertNotNull; +import static org.junit.Assert.assertThat; +import static org.junit.Assert.assertTrue; + +import java.util.HashMap; + +import javax.ws.rs.client.Entity; +import javax.ws.rs.client.Invocation; +import javax.ws.rs.core.Application; +import javax.ws.rs.core.MediaType; +import javax.ws.rs.core.Response; +import javax.ws.rs.core.Response.Status; + +import org.glassfish.jersey.test.JerseyTest; +import org.junit.Test; + +import com.baeldung.jersey.exceptionhandling.ExceptionHandlingConfig; +import com.baeldung.jersey.exceptionhandling.data.Stock; +import com.baeldung.jersey.exceptionhandling.data.Wallet; +import com.baeldung.jersey.exceptionhandling.rest.exceptions.IllegalArgumentExceptionMapper; +import com.baeldung.jersey.exceptionhandling.rest.exceptions.RestErrorResponse; +import com.baeldung.jersey.exceptionhandling.rest.exceptions.ServerExceptionMapper; + +public class StocksResourceIntegrationTest extends JerseyTest { + private static final Entity EMPTY_BODY = Entity.json(""); + private static final Stock STOCK = new Stock("BAEL", 51.57); + private static final String MY_WALLET = "MY-WALLET"; + private static final Wallet WALLET = new Wallet(MY_WALLET); + private static final int INSUFFICIENT_AMOUNT = (int) (Wallet.MIN_CHARGE - 1); + + @Override + protected Application configure() { + return new ExceptionHandlingConfig(); + } + + private Invocation.Builder stocks(String path) { + return target("/stocks" + path).request(); + } + + private Invocation.Builder wallets(String path, Object... args) { + return target("/wallets" + String.format(path, args)).request(); + } + + private Entity entity(Object object) { + return Entity.entity(object, MediaType.APPLICATION_JSON_TYPE); + } + + @Test + public void whenMethodNotAllowed_thenCustomMessage() { + Response response = stocks("").get(); + + assertEquals(Status.METHOD_NOT_ALLOWED.getStatusCode(), response.getStatus()); + + String content = response.readEntity(String.class); + assertThat(content, containsString(ServerExceptionMapper.HTTP_405_MESSAGE)); + } + + @Test + public void whenTickerNotExists_thenRestErrorResponse() { + Response response = stocks("/UNDEFINED").get(); + + assertEquals(Status.EXPECTATION_FAILED.getStatusCode(), response.getStatus()); + + RestErrorResponse content = response.readEntity(RestErrorResponse.class); + assertThat(content.getMessage(), startsWith(IllegalArgumentExceptionMapper.DEFAULT_MESSAGE)); + } + + @Test + public void givenAmountLessThanMinimum_whenAddingToWallet_thenInvalidTradeException() { + wallets("").post(entity(WALLET)); + Response response = wallets("/%s/%d", MY_WALLET, INSUFFICIENT_AMOUNT).put(EMPTY_BODY); + + assertEquals(Status.NOT_ACCEPTABLE.getStatusCode(), response.getStatus()); + + String content = response.readEntity(String.class); + assertThat(content, containsString(Wallet.MIN_CHARGE_MSG)); + } + + @Test + public void givenInsifficientFunds_whenBuyingStock_thenWebApplicationException() { + stocks("").post(entity(STOCK)); + wallets("").post(entity(WALLET)); + + Response response = wallets("/%s/buy/%s", MY_WALLET, STOCK.getId()).post(EMPTY_BODY); + assertEquals(Status.NOT_ACCEPTABLE.getStatusCode(), response.getStatus()); + + RestErrorResponse content = response.readEntity(RestErrorResponse.class); + assertNotNull(content.getSubject()); + + HashMap subject = (HashMap) content.getSubject(); + assertEquals(subject.get("id"), WALLET.getId()); + assertTrue(WALLET.getBalance() < Wallet.MIN_CHARGE); + } +}