Title (121. Best Time to Buy and Sell Stock)[https://leetcode.com/problems/best-time-to-buy-and-sell-stock/] Result Runtime: 369 ms, faster than 5.12% of Java online submissions for Best Time to Buy and Sell Stock. Memory Usage: 41.1 MB, less than 18.52% of Java online submissions for Best Time to Buy and Sell Stock. class Solution { public int maxProfit(int[] prices) { int max = 0; for(int i=0; i<prices.length; i++) { for(int j=i; j<prices.length; j++) { max = Math.

647. Palindromic Substrings Result Runtime: 1 ms, faster than 100.00% of Java online submissions for Palindromic Substrings. Memory Usage: 34.2 MB, less than 100.00% of Java online submissions for Palindromic Substrings. class Solution { public int countSubstrings(String s) { if (s.length() == 0) { return 0; } if (s.length() == 1) { return 1; } int count=0; for(int i = 0; i<s.length(); i++) { count = count + getPalindroms(s, i, i); count = count + getPalindroms(s, i, i+1); } return count; } private int getPalindroms(String s, int from, int to) { int count=0; while(from>=0 && to<s.

79. Word Search Result Runtime: 78 ms, faster than 38.82% of Java online submissions for Word Search. Memory Usage: 37.1 MB, less than 58.28% of Java online submissions for Word Search. class Solution { public boolean exist(char[][] board, String word) { for(int i=0; i<board.length; i++) { for(int j=0; j<board[0].length; j++) { if(board[i][j] == word.charAt(0)) { boolean value = existRec(board, word, j, i, new int[board.length][board[0].length], 0); if(value) return true; } } } return false; } public boolean existRec(char[][] board, String word, int x, int y, int[][] visited, int index) { if(index >= word.

Problem: javax.xml.transform.TransformerConfigurationException: Error checking type of the expression ‘funcall(replace, Solution: Make sure to be using an updated xsl transalation engine like, for instance, saxon 9. Maven dependency: net.sf.saxon Saxon-HE 9.8.0-3 Usage example: public ProductPool process(FeedProduct feedProduct) throws Exception { File stylesheet = new File("src/main/resources/XMLToCSVStyle.xsl"); File xmlSource = new File(feedFileName); File csvTarget = new File(feedFileName.replace(".xml", ".csv")); TransformerFactory tFactory = TransformerFactory.newInstance(); // TransformerFactoryImpl tFactoryImpl = (TransformerFactoryImpl) tFactory; // net.sf.saxon.Configuration saxonConfig = tFactoryImpl.

Problem: Transform a list of strings into a single string. One solution is to iterate over the list and append its contents. Remember that StringBuilder’s append is much faster than Strings concatenation. Solution: A better solution is relying on Java StringJoiner <![CDATA[ String.join(“, “, list); ]]> SyntaxHighlighter.highlight(); , or with Java 8 <![CDATA[ String joinedFirstNames = list.stream() .map(String::toString) .collect(Collectors.joining(“, “)); ]]> SyntaxHighlighter.highlight();

Solution: <![CDATA[ (…) Instant startTime; Instant endTime; (…) startTime = Instant.now(); (…) // do your processing here (…) endTime = Instant.now(); // . JobLog.incrTime(Duration.between(startTime, endTime).toMillis()); (…) try { difference = JobLog.getTime(); long diffSeconds = difference / 1000 % 60; long diffMinutes = difference / (60 * 1000) % 60; long diffHours = difference / (60 * 60 * 1000) % 24; long diffDays = difference / (24 * 60 * 60 * 1000); System.

Optional.ofNullable().orElse(new ())).toString(); for example: <![CDATA[ Optional.ofNullable(message).orElse(new String()).replace(”\t”, “ “); ]]> SyntaxHighlighter.highlight();

StringBuilder sb = new StringBuilder(); ofNullable(category).orElse(new LinkedList<>()).forEach(a->sb.append(a.toString()));

Remove an element from inside an array. Solution: Update update = new Update(); AdditionalProperty additionalProperty = new AdditionalProperty(); additionalProperty.setType("remove additional properties with this type"); update.pull("additionalProperty", additionalProperty); mongoClient.updateFirst(query, update, <collection\_name>);

<![CDATA[ @Override public String toString() { StringBuilder sb = new StringBuilder(); String value; sb.append(super.getClass().getName()); sb.append(”: “); sb.append(super.toString()); sb.append(getClass().getName()); sb.append(”: “); for (java.lang.reflect.Field f : Width.class.getDeclaredFields()) { try { value = f.get(this).toString(); sb.append(f.getName()); sb.append(“=”); sb.append(value); sb.append(“, “); } catch (Exception e) { } } return sb.toString(); } ]]> SyntaxHighlighter.highlight();

Problem: Update a nested element inside an array, lets say, the product “availability”. Example structure Solution:  The “non-trivial” part of this solution is the need for the “$” operator: <![CDATA[ (…) Query query = new Query(Criteria.where(“offers.offers.seller.name”).is(offer.getSeller().getName()) .and(“offers.offers.productId”).is(offer.getProductId())); update.set(“offers.offers.$.availability”, offer.getAvailability()); (…) ]]> SyntaxHighlighter.highlight();

Problem: Mongodb: Failed to connect to 127.0.0.1:27017, reason: errno:111 Connection refuse Solution: $ sudo rm /var/lib/mongodb/mongod.lock $ mongod –repair $ sudo service mongodb start

Problem: javax.persistence.PersistenceException: org.hibernate.PropertyAccessException: could not get a field value by reflection getter <![CDATA[ public BigDecimal getMinPrice(Product product){ logger.debug(“Entering getMinPrice. productId=”+product.getId()); Session session = this.sessionFactory.openSession(); Criteria criteria = session.createCriteria(ShopProductPriceHistory.class); criteria.add(Restrictions.eq(“product”, product.getId())); criteria.setProjection(Projections.min(“price”)); return (BigDecimal) criteria.uniqueResult(); } ]]> Solution: Check that the criteria is being done properly via join (Hibernate “Alias”). <![CDATA[ public BigDecimal getMaxPrice(Product product){ logger.debug(“Entering getMaxPrice. productId=”+product.getId()); Session session = this.sessionFactory.openSession(); Criteria criteria = session.createCriteria(ShopProductPriceHistory.class); criteria.createAlias(“product”, “product”).add(Restrictions.eq(“product.id”, product.getId())); criteria.setProjection(Projections.max(“price”)); return (BigDecimal) criteria.

Problem: Environment: Spring Batch Test database: H2 org.springframework.dao.DataAccessResourceFailureException: Could not obtain last\_insert\_id(); nested exception is org.h2.jdbc.JdbcSQLException: Invalid parameter count for "LAST\_INSERT\_ID", expected count: "0"; SQL statement: update BATCH_JOB_SEQ set ID = last_insert_id(ID + 1) <bean id="jobRepository" class="org.springframework.batch.core.repository.support.JobRepositoryFactoryBean"> <property name="dataSource" ref="dataSource" /> <property name="transactionManager" ref="transactionManager" /> <property name="databaseType" value="mysql" /> </bean> Solution: <bean id="jobRepository" class="org.springframework.batch.core.repository.support.JobRepositoryFactoryBean"> <property name="dataSource" ref="dataSource" /> <property name="transactionManager" ref="transactionManager" /> <property name="databaseType" value="h2" /> </bean> , besides, i also had to add two sequences to my spring batch scripts:

Solución: Añadir la etiqueta a la página JSP: , y la siguiente etiqueta para generar un número aleatorio: ${random.nextInt(N)} , por ejemplo: Generar un número aleatorio entre 1 y 4, con el fin de mostrar un fondo diferente en cada actualización de la página:

Problem: ProcessTest.class.getResourceAsStream(“H2/ddl/spring_batch/schema-drop.sql”); Solution: Check that the folder (““H2/ddl/spring_batch”) is part of the project classpath in eclipse: Right click on project Click “Build Path” Click “Configure Build Path…” Select “Java Build Path” Edit “Source” accordingly

<![CDATA[ (…) import com.mongodb.MongoClient; (…) MongoClient mongo = new MongoClient(Arrays.asList( new ServerAddress(””, ), new ServerAddress(””, ), new ServerAddress(””, ))); // you may need to use: // Integer.parseInt(”) ]]> SyntaxHighlighter.highlight();

Problem <![CDATA[ DBObject offers = (DBObject) ((DBObject)mongoClient.find(query, fields).next().get(“offers”)).get(“offers”); assertEquals(“efgh”, ((DBObject)offers.get(“url”)); ]]> BasicBSONList can only work with numeric keys, not: [url] Solution: Looking at the Intelij debug output the solution became obvious: offers = {BasicDBList@5718} size = 1 0 = {BasicDBObject@7368} size = 12 0 = {LinkedHashMap$Entry@7371} “@type” -> “Offer” 1 = {LinkedHashMap$Entry@7372} “availability” -> 2 = {LinkedHashMap$Entry@7373} “name” -> “xxx” 3 = {LinkedHashMap$Entry@7374} “description” -> “yyy” 4 = {LinkedHashMap$Entry@7375} “itemCondition” ->

Problem: Caused by: java.sql.SQLException: Column Index out of range, 0 < 1. Solution: Ebean “translates” the result columns names to “productEanId”, “productId” and “ean”. The solution is to give as alias the exact same names of the property to which the columns are going to be assigned: <![CDATA[ (…) String sql = “select icecat_product_ean.product_ean_id productEANId, “ + “icecat_product_ean.product_id productId, “ + “icecat_product_ean.ean ean “ + “from icecat_product_ean “; (…) ]]>

(based on http://schema.org/Product schema) <![CDATA[ private void update(String path, Object newValue, Integer productId, Integer retailerId) throws Exception { BasicDBObject query = new BasicDBObject(“productID”, String.valueOf(productId)) .append(“offers.offers.offerID”, String.valueOf(offerId))); BasicDBObject update = new BasicDBObject(“$set”, new BasicDBObject().append(“offers.offers.$.name”, newValue)); mongoDatasource.getMongoDatasource().update(query, update, false, true); } ]]> SyntaxHighlighter.highlight();

Problem: Get the current path from the inside the controller method Solution: <![CDATA[ play.mvc.Http.Context.Implicit.request().path() ]]> SyntaxHighlighter.highlight();

Queries only the “productID” and “@type” fields from all the collection documents: BasicDBObject fields = new BasicDBObject(); query.put(“productID”, 1); query.put(“@type”, 2); BasicDBObject allQuery = new BasicDBObject(); DBCursor cursor = mongoDatasource.getMongoDatasource().find(allQuery, fields); while(cursor.hasNext()) { DBObject document = cursor.next(); System.out.println(document); } Result: { “_id” : { “$oid” : “56c6c9e0612eb61e88166894”} , “@type” : “Product” , “productID” : “1”} Adding a new node to an exisitng array BasicDBObject query = new BasicDBObject().append(“productID”, String.valueOf(productId));

Problem: play javax.naming.NameNotFoundException: DefaultDS not found Solution: Make sure you include an jndiName to you database configuration, for example:  “db” : { “default” : { “driver” : com.mysql.jdbc.Driver }}, “db” : { “default” : { “url” : “jdbc:mysql://xxx.xxx.xxx.xxx:xxxx/” }}, “db” : { “default” : { “username” : }}, “db” : { “default” : { “password” : }}.  “db” : { “default” : { “jndiName” : DefaultDS }},

Problem:  “RuntimeException: There is no started application” <![CDATA[ @Test public void test1() { (…) assertEquals(…); ]]> Solution: <![CDATA[ (…) import static play.test.Helpers.fakeApplication; import static play.test.Helpers.running; (…) @Test public void test1() { running(fakeApplication(), new Runnable() { public void run() { subscriber.set(“key_1”, “value_1”); subscriber.set(“key_2”, “value_2”); subscriber.set(“key_3”, “value_3”); assertEquals(subscriber.get(“key_1”),“value_1”); ]]> SyntaxHighlighter.highlight();

Problem: IllegalStateException: path.home is not configured Solution:  Passing an activator initialization parameter (-Des.path.home): ./activator -DenvTarget=local -Des.path.home=/Project/Path/etc -jvm-debug 9010 clean compile run

Problem: When issuing an delete action Hibernate cascades up and deletes all the entity structure. _ for(ShopProductSpec shopProductSpec: shopProductSpecs) { shopProductSpecDAO.delete(shopProductSpec); }_  …  Hibernate: delete from shop_product_brand where shop_product_id=? Hibernate: delete from shop_product_brand where shop_product_id=? Hibernate: delete from shop_product_uid where id=? Hibernate: delete from shop_product_image where id=? Hibernate: delete from shop_product_image where id=? Hibernate: delete from shop_product_image where id=? Hibernate: delete from shop_product_image where id=? Hibernate: delete from shop_product_image where id=?

Build an Inner Join in Hibernate: Solution: @Entity @Table(name = “shop_product_uid”) public class ShopProductUid { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Long id; @ManyToOne(cascade = CascadeType.ALL) @JoinColumn(name = “shop_product_id”) private ShopProduct shopProduct; @Column(name = “shop_product_uid”) private String shopProductUid; @ManyToOne @JoinColumn(name = “shop_product_uid_type_id”) private ShopProductUidType shopProductUidType; Criteria criteria = session.createCriteria(ShopProductUid.class) criteria.createAlias(“shopProductUidType”, “shopProductUidType”) // inner join by default .add(Restrictions.eq(“shopProductUidType.typeId”, parameterTypeId));

Problem: Requests to return an JSON object returns Internal Server Error 500 Solution: Controller: @RequestMapping(method = RequestMethod.GET, value = "/get") public @ResponseBody Question getQuestionsAjax() { (...) return (...); } mvc-dispatcher-servlet.java: mvc:annotation-driven/ Pom.xml org.codehaus.jackson jackson-mapper-asl 1.9.0 org.codehaus.jackson jackson-core-asl 1.9.0 @RequestMapping(method = RequestMethod.GET, value = "/get") public @ResponseBody Question getQuestionsAjax() { (...) return (...); }

Problem: Caused by: java.lang.RuntimeException: There is no started application Solution: Tests under under Playframework need to be run inside fakeApplication() source: https://www.playframework.com/documentation/2.0/JavaTest <![CDATA[ import static org.fest.assertions.Assertions.assertThat; import static play.test.Helpers.fakeApplication; import static org.fest.assertions.Assertions.assertThat; import static play.test.Helpers.fakeApplication; import static play.test.Helpers.running; import org.junit.Test; import play.data.validation.ValidationError; public class AllTests { @Test public void validateBirthdate() { running(fakeApplication(), new Runnable() { public void run() { User user = new User(); List errors = new ArrayList(); user.

Problem: javax.persistence.PersistenceException: ERROR executing DML bindLog[] error[Column ‘graphId’ specified twice] (…) @Required public String city; @Required public String birthdate; @Required public String username; @Required public String password; public Long role_id; @ManyToOne @JoinColumn(name = “role_id”) public Role role; Solution:  Tell Hibernatee not to process the join column a “second time”: @ManyToOne @JoinColumn(name = “role_id”, insertable = false, updatable = false) public Role role;

Problem:  HTTP ERROR 500 Problem accessing /header.jsp. Reason: Connection refused  Caused by:java.net.ConnectException: Connection refused at java.net.PlainSocketImpl.socketConnect Solution:  Check that there are no calls hardcoded connections to localhost (JSP imports, etc)

Problema: errorThrown SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data Solucion: JSON esta esperando por lo menos un array vacio, un objecto tipo String (return new String()) no es suficiente. @RequestMapping(“/xxx”) public @ResponseBody String[] xxx(HttpServletRequest request, @RequestParam(“xxxx”) String xxx) { (…) return new String[]{“”}; } }

Problem:org.apache.jasper.JasperException: javax.servlet.ServletException: javax.servlet.jsp.JspException: Problem accessing the absolute URL “http://localhost:**8089**/xxxx/xxxx.jsp". java.net.ConnectException: Connection refused Solution: Fix the http port number on the application server. On this particular case it should be 8089.

Problem: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'beanXXX' defined in class path resource \[pathXXX/filenameXXX\]: Error setting property values; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property 'propertyXXX' of bean class \[packageXXX.classXXX\]: Bean property 'propertyXXX' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter? Solution Add the setter and getter methods for the invalid property.

Solution to Codility PermCheck Problem at: [https://codility.com/c/intro/demoJH2RM2-UZ8](https://codility.com/c/intro/demoJH2RM2-UZ8) `````` `````` class Solution { `````` public static void main(String[] args) { int A[] = {4, 1, 3, 2}; //int A[] = {4, 4, 3, 2}; //int A[] = {4, 3, 2}; //int A[] = {}; //int A[] = {1000000000, 3, 2}; //int A[] = {1000000000, 1000000001, 1000000002}; //int A[] = new int[100000]; System.out.println(solution(A)); } public static int solution(int[] A) { int result = 0; int size = A.

class Solution { public int solution(int X, int[] A) { // write your code in Java SE 8 int numberOfPositions = 0; int result = -1; int[] array = new int[X]; int index = 0;  // Initialize array for (int i : array) { array[index] = -1; index++; }  index = 0; for (int i : A) { try { if (array[i - 1] == -1) { array[i - 1] = index;

class Solution { public int solution(int[] B) { // write your code in Java SE 8 long[] rightToLeft = new long[A.length]; long[] leftToRight = new long[A.length]; long[] A = new long[B.length]; int result = -1; // Convert int array to long array int j = 0; for (int value : B) { A[j++] = (long)value; } for(int i=0; i<rightToLeft.length; i++){ if(i==0){ rightToLeft[i] = A[i]; } else { rightToLeft[i] = A[i] + rightToLeft[i-1]; } } for(int i=leftToRight.

In the example bellow the recipe description had something like:  100ml milk\r\n10g sugar which in html corresponded to the following textarea contents:  100ml milk  10g sugar  @RequestMapping(“/submitRecipe”) public String submitRecipe2(Model model, @ModelAttribute Recipe recipe, HttpServletRequest request) { model.addAttribute(“recipe”, recipe.getDescription().replace(”\r\n”, “%0A”)); return “result2”; }

Add the bellow tag to your jsp page: , and the followin tag to generate your random number: ${random.nextInt(N)} Particular case: Generate a random number, between 1 and 4, in order to display a different background at each page refresh:

Problem: “NetworkError 406 Not Acceptable” when calling a servlet using jQuery and expecting a JSON result. <![CDATA[ function getRecipeNutritionalInformation(recipe) { $.getJSON(“http://xxx/getRecipeNutritionalInformation?recipe=" + recipe, function(data){ res=jQuery.stringify(data); $.each(data, function(index) { alert(index); }); }) .success(function() { alert(“success”);}) .error(function(XMLHttpRequest, textStatus, errorThrown) { alert(“textStatus “+textStatus); alert(“errorThrown “+errorThrown);}) .complete(function() { alert(“complete”);}) ; } @RequestMapping(method=RequestMethod.GET, value=“/getRecipeNutritionalInformation”) public @ResponseBody NutritionalFacts getRecipeNutritionalInformation(@RequestParam(“recipe”) String input) { (…) } ]]> Solution: The JSON converting Maven dependencies (or plain libraries) might be missing on the project classpath:

Problema: java.lang.ClassNotFoundException: org.springframework.web.context.ContextLoaderListener Solución: Ir a las propriedades del proyecto (botón derecho del ratón sobre el nombre del proyecto) Seleccionar “Deployment Assembly”. “Add.. Seleccinar “Java Build Path Entries” “Next” Seleccinar “Maven Dependencies”  “Finish”

Problema: Por veces Maven deja de lograr encontrar nuevas dependencias. Una de las soluciones es actualizar los repositorios/indices locales de Maven Solución: Window -> Show View -> Maven Repositories

Problem: HTTP Status 500 - The absolute uri: http://java.sun.com/jsp/jstl/core cannot be resolved in either web.xml or the jar files deployed with this application Solution: Add the following Maven dependency: javax.servlet jstl 1.2 Or alternatively dowload and deploy the jstl jar file.

Problem: Sep 21, 2013 9:12:09 AM suncertify.main.URLyBirdMain main INFO: Executing in server mode. Sep 21, 2013 9:12:09 AM suncertify.server.RMIFactoryServerImpl INFO: rmi://127.0.0.1:1099/URLyBirdRMIServer java.rmi.server.ExportException: internal error: ObjID already in use at sun.rmi.transport.ObjectTable.putTarget(ObjectTable.java:169) at sun.rmi.transport.Transport.exportObject(Transport.java:74) at sun.rmi.transport.tcp.TCPTransport.exportObject(TCPTransport.java:229) at sun.rmi.transport.tcp.TCPEndpoint.exportObject(TCPEndpoint.java:393) at sun.rmi.transport.LiveRef.exportObject(LiveRef.java:129) at sun.rmi.server.UnicastServerRef.exportObject(UnicastServerRef.java:188) at sun.rmi.registry.RegistryImpl.setup(RegistryImpl.java:100) at sun.rmi.registry.RegistryImpl.(RegistryImpl.java:86) at java.rmi.registry.LocateRegistry.createRegistry(LocateRegistry.java:186) at suncertify.server.RMIFactoryServerImpl.(RMIFactoryServerImpl.java:38) at suncertify.server.RMIFactoryServerImpl.(RMIFactoryServerImpl.java:43) at suncertify.main.ServerModeMain.(ServerModeMain.java:54) at suncertify.main.URLyBirdMain.main(URLyBirdMain.java:41) and the class: public class RMIFactoryServerImpl extends UnicastRemoteObject implements RMIFactoryServer {  private static final long serialVersionUID = 2364209308189771862L;

Problem: Caused by: java.lang.IllegalArgumentException: illegal remote method encountered: public abstract java.util.List suncertify.server.Server.getAccomodation() Used Interface: public interface Server extends java.rmi.Remote, Serializable { List getAccomodation(); List getAccomodation(String criteria); List getAccomodation(int recNo); List bookAccomodation(int recNo); } Solution: Java RMI and Remote interface make mandatory for all methods to throw RemoteException public interface Server extends java.rmi.Remote, Serializable { List getAccomodation() throws RemoteException; List getAccomodation(String criteria) throws RemoteException; List getAccomodation(int recNo) throws RemoteException; List bookAccomodation(int recNo) throws RemoteException;

Problem: Caused by: org.hibernate.MappingException: Repeated column in mapping for collection: xxx.xxx.xxx.xxx: ID Cause by: <list name\="value" table\="QUESTION\_VALUE" cascade\="save-update, delete" fetch\="join" lazy\="true"\> <key column\="ID"/> **<index column\="ID"\></index\>** <one-to-many class\="com.mkyong.common.model.QuestionValue"/> </list\> Solution: User a field other than “ID”, in my case i created a “ORDER” and filled its value explicity.

In a Spring + Hibernate + Jackson project while calling: http://localhost:8080/SpringMVC/getAllBookmark (…) @RequestMapping(value=“/getAllBookmark”, method = RequestMethod.GET) public @ResponseBody List getAllBookmarkJSON() { List list = this.bookmarkDAO.getAllBookmark(); return list; } (…) , was getting the following error: at org.codehaus.jackson.map.ser.BeanSerializer.serialize(BeanSerializer.java:122) at org.codehaus.jackson.map.ser.ContainerSerializers$CollectionSerializer.serialize(ContainerSerializers.java:151) at org.codehaus.jackson.map.ser.ContainerSerializers$CollectionSerializer.serialize(ContainerSerializers.java:117) at org.codehaus.jackson.map.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:218) The problem was related to a cyclic reference (click here for more information) in a relation type “many-to-one” between Bookmark and Image: (…) public class Bookmark implements Serializable {

I have this problem.by use your solution.. i clear… Unknown - Jul 5, 2015 I have this problem.by use your solution.. i clear the error. Thnaks :) glad i could help Jeremias - Jul 5, 2015 :) glad i could help i have the same problem.but I have auto-generated … mozhi - Feb 2, 2016 i have the same problem.but I have auto-generated dao classes so i can’t add the line

Problem: SEVERE: Servlet.service() for servlet mvc-dispatcher threw exception org.hibernate.HibernateException: createQuery is not valid without active transaction at org.hibernate.context.ThreadLocalSessionContext$TransactionProtectionWrapper.invoke(ThreadLocalSessionContext.java:338) at com.sun.proxy.$Proxy20.createQuery(Unknown Source) at com.mkyong.common.dao.MessageDAO.getAllMessages(MessageDAO.java:39) at com.mkyong.common.controller.MessageController.printMessageList(MessageController.java:39) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:213) at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:126) at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:96) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:617) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:578) at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:923) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882) at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778) at javax.servlet.http.HttpServlet.service(HttpServlet.java:617) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.

Problem: If the instruction @Transactional(readOnly = true) is causing the bellow error(s): org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'xxx' defined in class path resource \[xxx/xxx.xml\]: Initialization of bean failed; nested exception is org.springframework.aop.framework.AopConfigException: Cannot proxy target class because CGLIB2 is not available. Add CGLIB to the class path or specify proxy interfaces. Caused by: org.springframework.aop.framework.AopConfigException: Cannot proxy target class because CGLIB2 is not available. Add CGLIB to the class path or specify proxy interfaces.

To import one class to your jsp file : <%@ page import=“java.util.List;” %> hello To import more than one using a short sintaxe: <%@ page import=“java.util.List,java.util.ArrayList;” %> hello To import more than one using in a more readable way: <%@ page import=“java.util.List” %> <%@ page import=“java.util.ArrayList” %> hello

To use mySql in your java projects in eclipse first go to http://dev.mysql.com/downloads/connector/j/ and download the connector, for example: mysql-connector-java-5.1.13-bin.jar Finally copy it to your lib folder, for example: path-to-your-workspace/your-workspace-name/WebContent/WEB-INF/lib Go to the eclipse, right button on the project name and select “Refresh”. Pay atention, to use the new imported jar you have to add one of the following imports to your classes: import com.mysql.jdbc.Driver; import com.