Java Decompiler Help !

Well ... I`m working on Java Decompiler Project as my
College Project.Now, my softare is already decompiling
simple programs but i`ve got stuck now at decompiling
characters, short ints & bytes because all of them are
stored as integers according to JVM Specification.
Simply,
These 2 Statements :-
int a=97;
AND
char b='a';
Result in same set of ByteCode Instructions :-
bipush 97
istore_<n>
Now, how can differentiate between the 2 so that i can
regenerate the source file ?
Any help is appreciated !!
Thx
Amit

Hi,
If you're talking about class variables then the type is in the "Field Info" structure of the class file.
http://java.sun.com/docs/books/vmspec/2nd-edition/html/ClassFile.doc.html#2877
If you're talking about local variables, then there's a LocalVariableTable structure, per method which has that information.
http://java.sun.com/docs/books/vmspec/2nd-edition/html/ClassFile.doc.html#5956
The localVariableTable information is only available when a java source is compiled with debugging information.
What I done, when I'd no localvariabletable in the class file, was to create my own dynamic localVariableTable object, and fill in the types based on the operations performed on them, or their operands type.
I'd use the narrowest data type to start with, and widen it as needed.
So, in your example, it would guess character, until another operation conflicted with that. It's not bulletproof, but better than nothing.
regards,
Owen

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// Decompiled by Jad v1.5.8g. Copyright 2001 Pavel Kouznetsov.
// Jad home page: http://www.kpdus.com/jad.html
// Decompiler options: packimports(3)
// Source File Name: DetailDataInputCO.java
package oracle.apps.ap.oie.webui;
import com.sun.java.util.collections.HashMap;
import java.io.Serializable;
import java.util.Vector;
import oracle.apps.ap.oie.entry.AttendeeRuleUI;
import oracle.apps.ap.oie.server.DetailAMImpl;
import oracle.apps.ap.oie.utility.OIEConstants;
import oracle.apps.ap.oie.utility.OIEUtil;
import oracle.apps.fnd.common.MessageToken;
import oracle.apps.fnd.common.VersionInfo;
import oracle.apps.fnd.flexj.*;
import oracle.apps.fnd.framework.*;
import oracle.apps.fnd.framework.webui.*;
import oracle.apps.fnd.framework.webui.beans.*;
import oracle.apps.fnd.framework.webui.beans.form.OAChoiceBean;
import oracle.apps.fnd.framework.webui.beans.form.OASubmitButtonBean;
import oracle.apps.fnd.framework.webui.beans.layout.*;
import oracle.apps.fnd.framework.webui.beans.message.*;
import oracle.apps.fnd.framework.webui.beans.nav.OANavigationBarBean;
import oracle.apps.fnd.framework.webui.beans.nav.OAPageButtonBarBean;
import oracle.apps.fnd.framework.webui.beans.table.*;
import oracle.cabo.ui.*;
import oracle.cabo.ui.beans.*;
import oracle.cabo.ui.beans.form.*;
import oracle.cabo.ui.beans.layout.*;
import oracle.cabo.ui.beans.message.MessageStyledTextBean;
import oracle.cabo.ui.beans.message.MessageTextInputBean;
import oracle.cabo.ui.beans.nav.NavigationBarBean;
import oracle.cabo.ui.beans.table.ColumnBean;
import oracle.cabo.ui.beans.table.TableBean;
import oracle.jbo.domain.Number;
// Referenced classes of package oracle.apps.ap.oie.webui:
// ExpensesCO, NavigationUtility
public class DetailDataInputCO extends OAControllerImpl
public void processRequest(OAPageContext oapagecontext, OAWebBean oawebbean)
if(oapagecontext.isLoggingEnabled(2))
oapagecontext.writeDiagnostics(this, "start processRequest", 2);
boolean flag = false;
super.processRequest(oapagecontext, oawebbean);
OAApplicationModule oaapplicationmodule = oapagecontext.getRootApplicationModule();
OAApplicationModule oaapplicationmodule1 = oapagecontext.getApplicationModule(oawebbean);
String s = (String)oaapplicationmodule.invokeMethod("getMultipleCurrenciesFlag");
String s1 = (String)oapagecontext.getTransactionValue("ApWebTaxEnable");
String s2 = (String)oapagecontext.getTransactionValue("PaymentCurrencyCode");
String s3 = (String)oapagecontext.getTransactionValue("ApWebDescFlexName");
String s4 = (String)oapagecontext.getTransactionValue("CCPage");
boolean flag2 = s4 == null || s4.equals("Y");
boolean flag3 = ((String)oapagecontext.getTransactionValue("IsProjectEnabled")).equals("Y") || ((String)oapagecontext.getTransactionValue("IsProjectEnabled")).equals("R");
String s5 = (String)oapagecontext.getTransactionValue("ApWebEnableGrantsAccounting");
boolean flag4 = flag3 && s5 != null && s5.equals("Y");
boolean flag5 = ((Boolean)oaapplicationmodule.invokeMethod("isVATEnabled")).booleanValue();
String _tmp = (String)oapagecontext.getTransactionValue("ApWebEnableLineLevelAccounting");
oapagecontext.getParameter("ButtonLink");
String s6 = "N";
oracle.apps.ap.oie.setup.OIESetup.Setup setup = (oracle.apps.ap.oie.setup.OIESetup.Setup)oaapplicationmodule.invokeMethod("getSetup");
OADescriptiveFlexBean oadescriptiveflexbean = null;
OAStackLayoutBean oastacklayoutbean = (OAStackLayoutBean)createWebBean(oapagecontext, "STACK_LAYOUT");
oawebbean.addIndexedChild(oastacklayoutbean);
OATableLayoutBean oatablelayoutbean = (OATableLayoutBean)createWebBean(oapagecontext, "TABLE_LAYOUT");
oastacklayoutbean.addIndexedChild(oatablelayoutbean);
oatablelayoutbean.setWidth("100%");
OASpacerRowBean oaspacerrowbean = (OASpacerRowBean)createWebBean(oapagecontext, "SPACER_ROW");
if(flag5)
OARowLayoutBean oarowlayoutbean = (OARowLayoutBean)createWebBean(oapagecontext, "ROW_LAYOUT");
oatablelayoutbean.addRowLayout(oarowlayoutbean);
OACellFormatBean oacellformatbean = (OACellFormatBean)createWebBean(oapagecontext, "CELL_FORMAT");
oarowlayoutbean.addIndexedChild(oacellformatbean);
OARawTextBean oarawtextbean = (OARawTextBean)createWebBean(oapagecontext, "RAW_TEXT");
oacellformatbean.addIndexedChild(oarawtextbean);
oacellformatbean.setHAlign("start");
oacellformatbean.setColumnSpan(2);
oarawtextbean.setText(oapagecontext.getMessage("SQLAP", "OIE_MERCHANT_HEADING", new MessageToken[0]));
oarawtextbean.setStyleClass("OraInstructionText");
oatablelayoutbean.addIndexedChild(oaspacerrowbean);
OARowLayoutBean oarowlayoutbean1 = (OARowLayoutBean)createWebBean(oapagecontext, "ROW_LAYOUT");
oatablelayoutbean.addRowLayout(oarowlayoutbean1);
OACellFormatBean oacellformatbean1 = (OACellFormatBean)createWebBean(oapagecontext, "CELL_FORMAT");
oarowlayoutbean1.addIndexedChild(oacellformatbean1);
OATableLayoutBean oatablelayoutbean1 = (OATableLayoutBean)createWebBean(oapagecontext, oawebbean, "DRRequiredIconText");
oacellformatbean1.addIndexedChild(oatablelayoutbean1);
oatablelayoutbean.addIndexedChild(oaspacerrowbean);
OARowLayoutBean oarowlayoutbean2 = (OARowLayoutBean)createWebBean(oapagecontext, "ROW_LAYOUT");
oatablelayoutbean.addRowLayout(oarowlayoutbean2);
OACellFormatBean oacellformatbean2 = (OACellFormatBean)createWebBean(oapagecontext, "CELL_FORMAT");
OACellFormatBean oacellformatbean3 = (OACellFormatBean)createWebBean(oapagecontext, "CELL_FORMAT");
oarowlayoutbean2.addIndexedChild(oacellformatbean2);
oarowlayoutbean2.addIndexedChild(oacellformatbean3);
OATableLayoutBean oatablelayoutbean2 = (OATableLayoutBean)createWebBean(oapagecontext, "TABLE_LAYOUT");
OATableLayoutBean oatablelayoutbean3 = (OATableLayoutBean)createWebBean(oapagecontext, "TABLE_LAYOUT");
oacellformatbean2.addIndexedChild(oatablelayoutbean2);
oacellformatbean2.setVAlign("top");
oacellformatbean3.addIndexedChild(oatablelayoutbean3);
oacellformatbean3.setVAlign("top");
oatablelayoutbean2.addIndexedChild(createWebBean(oapagecontext, oawebbean, "DetailStartDate"));
oatablelayoutbean2.addIndexedChild(oaspacerrowbean);
oatablelayoutbean2.addIndexedChild(createWebBean(oapagecontext, oawebbean, "DetailDailyRate"));
oatablelayoutbean2.addIndexedChild(oaspacerrowbean);
oatablelayoutbean2.addIndexedChild(createWebBean(oapagecontext, oawebbean, "DetailDays"));
oatablelayoutbean2.addIndexedChild(oaspacerrowbean);
if(flag2)
OAMessageStyledTextBean oamessagestyledtextbean = (OAMessageStyledTextBean)createWebBean(oapagecontext, oawebbean, "DetailDisplayReceiptAmount");
oatablelayoutbean2.addIndexedChild(oamessagestyledtextbean);
oatablelayoutbean2.addIndexedChild(oaspacerrowbean);
oamessagestyledtextbean.setText(oamessagestyledtextbean.getText(oapagecontext) != null ? oamessagestyledtextbean.getText(oapagecontext) + " " : "");
if(oamessagestyledtextbean.getText(oapagecontext) != null && !oamessagestyledtextbean.getText(oapagecontext).equals(""))
OAStyledTextBean oastyledtextbean = (OAStyledTextBean)createWebBean(oapagecontext, "TEXT");
oastyledtextbean.setViewUsageName("OneReceiptBasedVO");
oastyledtextbean.setViewAttributeName("ReceiptCurrencyCode");
oastyledtextbean.setCSSClass("OraDataText");
oamessagestyledtextbean.setEnd(oastyledtextbean);
} else
OAMessageTextInputBean oamessagetextinputbean = (OAMessageTextInputBean)createWebBean(oapagecontext, oawebbean, "DetailReceiptAmount");
oatablelayoutbean2.addIndexedChild(oamessagetextinputbean);
oatablelayoutbean2.addIndexedChild(oaspacerrowbean);
if(s.equals("N"))
OAStyledTextBean oastyledtextbean1 = (OAStyledTextBean)createWebBean(oapagecontext, "TEXT");
oastyledtextbean1.setViewUsageName("OneReceiptBasedVO");
oastyledtextbean1.setViewAttributeName("ReceiptCurrencyCode");
oastyledtextbean1.setCSSClass("OraDataText");
oamessagetextinputbean.setEnd(oastyledtextbean1);
} else
OAChoiceBean oachoicebean = (OAChoiceBean)createWebBean(oapagecontext, "POPLIST", null, "CurrencyPopList");
oachoicebean.setViewUsageName("OneReceiptBasedVO");
oachoicebean.setViewAttributeName("ReceiptCurrencyCode");
oachoicebean.setPickListViewObjectDefinitionName("oracle.apps.ap.oie.server.CurrenciesVO");
oachoicebean.setListValueAttribute("CurrencyCode");
oachoicebean.setListDisplayAttribute("CurrencyCodeName");
OAStaticStyledTextBean oastaticstyledtextbean = (OAStaticStyledTextBean)createWebBean(oapagecontext, oawebbean, "Currency");
oachoicebean.setShortDesc(oastaticstyledtextbean.getLabel());
oamessagetextinputbean.setEnd(oachoicebean);
if(flag2 || s.equals("N"))
OAMessageStyledTextBean oamessagestyledtextbean1 = (OAMessageStyledTextBean)createWebBean(oapagecontext, oawebbean, "DetailDisplayExchRate");
oatablelayoutbean2.addIndexedChild(oamessagestyledtextbean1);
oatablelayoutbean2.addIndexedChild(oaspacerrowbean);
} else
OAMessageTextInputBean oamessagetextinputbean1 = (OAMessageTextInputBean)createWebBean(oapagecontext, oawebbean, "DetailExchRate");
oatablelayoutbean2.addIndexedChild(oamessagetextinputbean1);
oatablelayoutbean2.addIndexedChild(oaspacerrowbean);
oamessagetextinputbean1.setRequired("yes");
OAMessageStyledTextBean oamessagestyledtextbean2 = (OAMessageStyledTextBean)createWebBean(oapagecontext, oawebbean, "DetailReimbursAmt");
oatablelayoutbean2.addIndexedChild(oamessagestyledtextbean2);
if(oamessagestyledtextbean2.getText(oapagecontext) != null)
oamessagestyledtextbean2.setText(oamessagestyledtextbean2.getText(oapagecontext) + " " + s2);
oatablelayoutbean2.addIndexedChild(oaspacerrowbean);
OAMessageCheckBoxBean oamessagecheckboxbean = (OAMessageCheckBoxBean)createWebBean(oapagecontext, oawebbean, "DetailReceiptMissing");
oatablelayoutbean2.addIndexedChild(oamessagecheckboxbean);
oatablelayoutbean2.addIndexedChild(oaspacerrowbean);
Integer integer = (Integer)oaapplicationmodule.invokeMethod("getNumberOfTaxCodes");
String s7 = (String)oaapplicationmodule1.invokeMethod("getTaxCodeUpdateable");
OAWebBeanDataAttribute oawebbeandataattribute;
if(s7 == null || s7.equals("Y"))
oawebbeandataattribute = (OAWebBeanDataAttribute)createWebBean(oapagecontext, oawebbean, "DetailTaxCode");
else
oawebbeandataattribute = (OAWebBeanDataAttribute)createWebBean(oapagecontext, oawebbean, "DetailTaxCodeDisplay");
OAMessageCheckBoxBean oamessagecheckboxbean1 = (OAMessageCheckBoxBean)createWebBean(oapagecontext, oawebbean, "DetailAmtInclTax");
if(s1 != null && s1.equals("Y") && integer.intValue() > 0)
oatablelayoutbean2.addIndexedChild(oamessagecheckboxbean1);
oatablelayoutbean2.addIndexedChild(oaspacerrowbean);
oatablelayoutbean2.addIndexedChild(oawebbeandataattribute);
oatablelayoutbean2.addIndexedChild(oaspacerrowbean);
String s8 = (String)oaapplicationmodule1.invokeMethod("getExpTypeWebPrompt");
Object obj = null;
Object obj1 = null;
Boolean boolean1 = (Boolean)oaapplicationmodule1.invokeMethod("isExpTypeInPoplist");
if(flag4 && !boolean1.booleanValue())
oaapplicationmodule1.invokeMethod("resetWebParameterId");
String s11 = (String)oaapplicationmodule1.invokeMethod("getAwardNumber");
MessageToken amessagetoken[] = {
new MessageToken("EXP_TYPE", s8), new MessageToken("AWARD_NUM", s11 != null ? s11 : "")
OAException oaexception = new OAException("SQLAP", "OIE_DEFAULT_EXPENDITURE_TYPE", amessagetoken, (byte)1, null);
oaexception.setApplicationModule(oaapplicationmodule1);
oapagecontext.putDialogMessage(oaexception);
OAMessageLovInputBean oamessagelovinputbean = (OAMessageLovInputBean)createWebBean(oapagecontext, oawebbean, "DetailProjectNumber");
OAMessageLovInputBean oamessagelovinputbean1 = (OAMessageLovInputBean)createWebBean(oapagecontext, oawebbean, "DetailTaskNumber");
if(flag3)
oatablelayoutbean3.addIndexedChild(oamessagelovinputbean);
oatablelayoutbean3.addIndexedChild(oaspacerrowbean);
oatablelayoutbean3.addIndexedChild(oamessagelovinputbean1);
oatablelayoutbean3.addIndexedChild(oaspacerrowbean);
String s12 = (String)oaapplicationmodule1.invokeMethod("getProjectNumber");
if(s12 != null)
oamessagelovinputbean1.setRequired("yes");
else
oamessagelovinputbean1.setRequired("no");
if(flag4)
OAMessageLovInputBean oamessagelovinputbean2 = (OAMessageLovInputBean)createWebBean(oapagecontext, oawebbean, "DetailAwardNumber");
oatablelayoutbean3.addIndexedChild(oamessagelovinputbean2);
oatablelayoutbean3.addIndexedChild(oaspacerrowbean);
oatablelayoutbean3.addIndexedChild(createWebBean(oapagecontext, oawebbean, "RBWebParam"));
if(s3 != null && ("Y".equals(s3) || "B".equals(s3)))
oadescriptiveflexbean = (OADescriptiveFlexBean)createWebBean(oapagecontext, oawebbean, "DetailFlex");
oatablelayoutbean3.addIndexedChild(oadescriptiveflexbean);
oatablelayoutbean3.addIndexedChild(oaspacerrowbean);
if(flag4)
OAStyledTextBean oastyledtextbean2 = (OAStyledTextBean)createWebBean(oapagecontext, "TEXT");
oatablelayoutbean3.addIndexedChild(oastyledtextbean2);
String s9 = oapagecontext.getMessage("SQLAP", "OIE_EXPENDITURE_TYPE_TIP", null);
oastyledtextbean2.setText(oapagecontext, s9);
oastyledtextbean2.setStyleClass("OraInlineInfoText");
OAWebBeanDataAttribute oawebbeandataattribute1 = null;
if(oapagecontext.getParameter("_FORMEVENT") == null || !oapagecontext.getParameter("_FORMEVENT").startsWith("FLEX_CONTEXT_CHANGED"))
if(!boolean1.booleanValue() && s8 != null)
oadescriptiveflexbean.setFlexContext(oapagecontext, null);
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null
oapagecontext.getApplicationModule(oawebbean).invokeMethod("onChangeExpenseDFFContext", aserializable);
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oadescriptiveflexbean.setFlexContext(oapagecontext, s8);
oadescriptiveflexbean.processFlex(oapagecontext);
oawebbeandataattribute1 = (OAWebBeanDataAttribute)oadescriptiveflexbean.getIndexedChild(null, 0);
oadescriptiveflexbean.setFlexTableRendered(false);
oatablelayoutbean3.addIndexedChild(oawebbeandataattribute1);
oatablelayoutbean3.addIndexedChild(oaspacerrowbean);
if(!boolean1.booleanValue() && s8 != null)
oawebbeandataattribute1.setRequired("no");
else
oawebbeandataattribute1.setRequired("yes");
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int i = descriptiveflexfield.indexOfContextSegment();
if(oapagecontext.getParameter("_FORMEVENT") != null && oapagecontext.getParameter("_FORMEVENT").startsWith("FLEX_CONTEXT_CHANGED"))
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OAMessageChoiceBean oamessagechoicebean = (OAMessageChoiceBean)createWebBean(oapagecontext, oawebbean, "DetailExpType");
oatablelayoutbean3.addIndexedChild(oamessagechoicebean);
oatablelayoutbean3.addIndexedChild(oaspacerrowbean);
oamessagechoicebean.setPickListViewUsageName("DetailExpenseTypesVO");
if(flag4)
OAStyledTextBean oastyledtextbean3 = (OAStyledTextBean)createWebBean(oapagecontext, "TEXT");
oatablelayoutbean3.addIndexedChild(oastyledtextbean3);
String s10 = oapagecontext.getMessage("SQLAP", "OIE_EXPENDITURE_TYPE_TIP", null);
oastyledtextbean3.setText(oapagecontext, s10);
oastyledtextbean3.setStyleClass("OraInlineInfoText");
if(flag3)
String s13 = (String)oaapplicationmodule1.invokeMethod("getExpenditureType");
boolean flag7 = ((String)oapagecontext.getTransactionValue("IsProjectEnabled")).equals("R") && s13 != null;
if(flag7)
oamessagelovinputbean.setRequired("yes");
oamessagelovinputbean1.setRequired("yes");
boolean flag6 = ((Boolean)oaapplicationmodule1.invokeMethod("isLocationSchedule")).booleanValue();
boolean flag8 = flag5 || flag6;
if(setup.getReceiptBasedLocation() != null)
flag8 = setup.getReceiptBasedLocation().booleanValue() || flag8;
if(flag8)
if(flag6 || flag5)
OAMessageLovInputBean oamessagelovinputbean3 = (OAMessageLovInputBean)createWebBean(oapagecontext, oawebbean, "LocationName");
oatablelayoutbean3.addIndexedChild(oamessagelovinputbean3);
oamessagelovinputbean3.setRequired("yes");
oatablelayoutbean3.addIndexedChild(createWebBean(oapagecontext, oawebbean, "LocationId"));
} else
OAMessageTextInputBean oamessagetextinputbean2 = (OAMessageTextInputBean)createWebBean(oapagecontext, oawebbean, "RBLocation");
oatablelayoutbean3.addIndexedChild(oamessagetextinputbean2);
oatablelayoutbean3.addIndexedChild(oaspacerrowbean);
if(flag2)
OAMessageStyledTextBean oamessagestyledtextbean3 = (OAMessageStyledTextBean)createWebBean(oapagecontext, oawebbean, "TransactionLocation");
oatablelayoutbean3.addIndexedChild(oamessagestyledtextbean3);
oatablelayoutbean3.addIndexedChild(oaspacerrowbean);
Object obj2 = null;
Object obj3 = null;
String s17 = null;
if((OAMessageTextInputBean)oawebbean.findIndexedChildRecursive("RBLocation") != null)
OAMessageTextInputBean oamessagetextinputbean5 = (OAMessageTextInputBean)oawebbean.findIndexedChildRecursive("RBLocation");
s17 = (String)oamessagetextinputbean5.getValue(oapagecontext);
} else
if((OAMessageLovInputBean)oawebbean.findIndexedChildRecursive("LocationName") != null)
OAMessageLovInputBean oamessagelovinputbean4 = (OAMessageLovInputBean)oawebbean.findIndexedChildRecursive("LocationName");
s17 = (String)oamessagelovinputbean4.getValue(oapagecontext);
OAMessageStyledTextBean oamessagestyledtextbean5 = (OAMessageStyledTextBean)oawebbean.findIndexedChildRecursive("TransactionLocation");
String s19 = (String)oaapplicationmodule1.invokeMethod("getTransactionLocation");
if(s19 != null && !s19.equalsIgnoreCase(s17))
oamessagestyledtextbean5.setValue(oapagecontext, s19);
oamessagestyledtextbean3.setRendered(true);
boolean flag1 = true;
} else
oamessagestyledtextbean3.setRendered(false);
if(flag2)
OAMessageStyledTextBean oamessagestyledtextbean4 = (OAMessageStyledTextBean)createWebBean(oapagecontext, oawebbean, "DetailDisplayMerchantName");
oatablelayoutbean3.addIndexedChild(oamessagestyledtextbean4);
oatablelayoutbean3.addIndexedChild(oaspacerrowbean);
} else
OAMessageTextInputBean oamessagetextinputbean3 = (OAMessageTextInputBean)createWebBean(oapagecontext, oawebbean, "DetailMerchantName");
Serializable aserializable1[] = {
getLocationId(oapagecontext, oawebbean)
Class aclass[] = {
oracle.jbo.domain.Number.class
if(((Boolean)oaapplicationmodule1.invokeMethod("isMerchantRequired", aserializable1, aclass)).booleanValue())
oamessagetextinputbean3.setRequired("yes");
oatablelayoutbean3.addIndexedChild(oamessagetextinputbean3);
oatablelayoutbean3.addIndexedChild(oaspacerrowbean);
}

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